Issue with product picture during onboarding

[monsieurtanuki]

What

• During the onboarding, the product picture isn't properly refreshed and displays an error instead.

Steps to reproduce the behavior

1. Restart the onboarding
2. Go to the "good product" page
3. See error

Screenshot/Mockup/Before-After

Logs

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following assertion was thrown building Image(image:
NetworkImage("https://images.openfoodfacts.org/images/products/093/270/067/481501/front_en.280.400.jpg",
scale: 1.0), frameBuilder: null, loadingBuilder: Closure: (BuildContext, Widget, ImageChunkEvent?)
=> Widget, width: 102.9, height: 102.9, fit: contain, alignment: Alignment.center,
this.excludeFromSemantics: false, filterQuality: medium, dirty, dependencies: [Directionality,
MediaQuery, _EffectiveTickerMode, _LocalizationsScope-[GlobalKey#9fbd3]], state:
_ImageState#86901(stream: ImageStream#0f57f(MultiFrameImageStreamCompleter#48530, unresolved, 2
listeners, 0 ephemeralErrorListeners), pixels: null, loadingProgress: null, frameNumber: null,
wasSynchronouslyLoaded: false)):
setState() or markNeedsBuild() called during build.
This ProductPicture widget cannot be marked as needing to build because the framework is already in
the process of building widgets. A widget can be marked as needing to be built during the build
phase only if one of its ancestors is currently building. This exception is allowed because the
framework builds parent widgets before children, which means a dirty descendant will always be
built. Otherwise, the framework might not visit this widget during this build phase.
The widget on which setState() or markNeedsBuild() was called was:
  ProductPicture
The widget which was currently being built when the offending call was made was:
  Image

The relevant error-causing widget was:
  Image
  Image:file:///C:/Users/fabri/StudioProjects/smooth-app/packages/smooth_app/lib/cards/product_cards/smooth_product_imag
  e.dart:286:26

When the exception was thrown, this was the stack:
#0      Element.markNeedsBuild.<anonymous closure> (package:flutter/src/widgets/framework.dart:5177:9)
#1      Element.markNeedsBuild (package:flutter/src/widgets/framework.dart:5189:6)
#2      State.setState (package:flutter/src/widgets/framework.dart:1223:15)
#3      _ProductPictureState.build.<anonymous closure>
(package:smooth_app/cards/product_cards/smooth_product_image.dart:103:24)
#4      _ProductPictureWithImageProvider._buildImage.<anonymous closure>
(package:smooth_app/cards/product_cards/smooth_product_image.dart:305:17)
#5      _ImageState.build (package:flutter/src/widgets/image.dart:1268:36)
#6      StatefulElement.build (package:flutter/src/widgets/framework.dart:5729:27)
#7      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:5617:15)
#8      StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:5780:11)
#9      Element.rebuild (package:flutter/src/widgets/framework.dart:5333:7)
#10     BuildScope._tryRebuild (package:flutter/src/widgets/framework.dart:2693:15)
#11     BuildScope._flushDirtyElements (package:flutter/src/widgets/framework.dart:2752:11)
#12     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:3048:18)
#13     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1162:21)
#14     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:468:5)
#15     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1397:15)
#16     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1318:9)
#17     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:1176:5)
#18     _invoke (dart:ui/hooks.dart:312:13)
#19     PlatformDispatcher._drawFrame (dart:ui/platform_dispatcher.dart:419:5)
#20     _drawFrame (dart:ui/hooks.dart:283:31)

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