Bugfix/Misplaced icons on linux builds

[D-Brox]

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Description

This PR fixes the missing icons Deb, Appimage and Snap builds due to an old electron-builder bug (electron-userland/electron-builder#5294) by referencing a folder instead of a file.

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI

Related Tickets & Documents

Fixes #389

Added tests?

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help

Added to documentation?

• 📜 README.md
• 📓 tech-docs
• 🙅 no documentation needed

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[D-Brox]

I have read the CLA Document and I hereby sign the CLA

[ra3orblade]

You forgot to change windows icon path accordingly:

"win": {
			"sign": "./electron/hook/sign.js",
			"target": "nsis",
			"icon": "electron/img/icons/256x256.png",

[fuksman]

@any contributor @D-Brox code