Power: Suppress Shutdown on Idle While Charging / Plugged In

[luu176]

This implements safeguard to prevent the flipper zero from shutting down while it's in a charging state. By doing so, we ensure that the battery charges fully without interruption.

What's new

• Modified the power_auto_shutdown_timer_callback function to check the power state.
• If the device is charging, the shutdown process is suppressed, and the original shutdown timer is restarted based on the configured shutdown_idle_delay_ms
• The shutdown_idle_delay_ms value is now dynamically retrieved from the PowerSettings to ensure the timer is set accurately according to user-defined settings.

[Willy-JL]

The shutdown_idle_delay_ms value is now dynamically retrieved from the PowerSettings to ensure the timer is set accurately according to user-defined settings.

no point, when user changes this value, it is updated in service accordingly. this is just loading from file when theres no need to :D