Fixed sample YAML for a couple of Sonoff devices, to match current ESPHome

[juicejuice]

Brief description of the changes

Fixed sample YAML for a couple of Sonoff devices, to match current ESPHome

Type of changes

• New device
• Update existing device
• Removing a device
• General cleanup
• Other

Checklist:

• There are no passwords or secrets references in any examples.
  The only exceptions are !secret wifi_ssid and !secret wifi_password.
• The wifi or ethernet block has no static / manual ip address specified.
• The first configuration provided should be hardware definitions only.
  A more involved example can be provided in a separate configuration block.

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[juicejuice]

The intent of this is to correct the sample YAML configuration for a couple of Sonoff devices (POWR316D and POWR320D). When I set these up the other day it appeared that ESPHome has changed since the YAML was written, meaning that the configuration code needed tweaking in order to work. I figured it would be good to update this so others don't need to do the same in future.