Media player toggle action changed

The implementation of the toggle action service has been adjusted in the media player base class. The media player will now be turned on if it is in the states off or standby; in all other states, it will be turned off.

Before this change, the media player would also be turned on if it was in state idle. This was not in line with the meaning of the idle state, as it is counted as a state where the device is already turned on.

Custom integrations which have overridden the async_toggle may need to update their implementations.

The change is introduced in the home assistant core PR #78192.