Add some dolby pl2 mappings

[xconverge]

I assume this is right..not really sure but seems doable with the log messages provided

Fixes #268

Also adds one I saw

Logger: denonavr.soundmode
Source: components/denonavr/media_player.py:362
First occurred: January 1, 2024 at 1:23:02 PM (1 occurrences)
Last logged: January 1, 2024 at 1:23:02 PM

Not able to match sound mode: 'DOLBY PLII GAME', assuming 'DOLBY DIGITAL'.

[starkillerOG]

Seems good to me, thanks for the PR!

@ol-iver could you merge this?

[ol-iver]

thanks 😄