Initialize both the stored and actual states to off

[MonicaisHer]

This PR will resolve https://github.com/canonical/matter-pi-gpio-commander/issues/14.

In this matter file, a default value of 0 is set for the onOff attribute, ensuring that the LED remains off upon initialization. This PR aligns the application's behavior with the default setting.

Testing

Install and setup matter-pigpio-commander:

sudo snap install ./matter-pi-gpio-commander_0.3.0+sync-gpio_arm64.snap --dangerous
sudo snap set matter-pi-gpio-commander gpio=26
sudo snap connect matter-pi-gpio-commander:avahi-control
sudo snap connect matter-pi-gpio-commander:gpio-memory-control
sudo snap start matter-pi-gpio-commander

Commission and control via chip-tool:

• toggle

  sudo snap install chip-tool
  sudo snap connect chip-tool:avahi-observe
  sudo snap connect chip-tool:bluez
  sudo chip-tool pairing onnetwork 110 20202021
  sudo chip-tool onoff toggle 110 1

  The first chip-tool onoff toggle command can turn the LED on. Here is the log when the toggle command sent:

  $ journalctl -f | grep matter-pi-gpio-commander
  CHIP:DMG: AccessControl: allowed
  CHIP:DMG: Received command for Endpoint=1 Cluster=0x0000_0006 Command=0x0000_0002
  CHIP:ZCL: Toggle ep1 on/off from state 0 to 1

• on

  sudo snap install chip-tool
  sudo snap connect chip-tool:avahi-observe
  sudo snap connect chip-tool:bluez
  sudo chip-tool pairing onnetwork 110 20202021
  sudo chip-tool onoff on 110 1

The first chip-tool onoff on command can turn the LED on. Here is the log when the on command sent:

$ journalctl -f | grep matter-pi-gpio-commander
CHIP:DMG: AccessControl: allowed
CHIP:DMG: Received command for Endpoint=1 Cluster=0x0000_0006 Command=0x0000_0001
CHIP:ZCL: Toggle ep1 on/off from state 0 to 1