fix(lyrics-plus): persist user preferred lyrics mode with fallback

[heinthanth]

The problem I'm facing

I usually use Lyrics plus in Synced mode. However, when the Karoke mode is available in lyrics, Lyrics plus switched to Karaoke mode automatically (which disable the convert, translation features). I have to switch back to sync mode manually.

The fix

Now, user selected mode has higher priority. However, it will automatically fallback to available mode temporarily if the user selected mode is not supported by the lyrics.

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[coderabbitai]

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