[BUG] Album artist is set based on song title's position in alphabet, which is weird

[nift4]

Describe the bug
Album artist is set when finding the first song from that album based on artist field, which is a bit too simple.
Compilation albums commonly have no album artists, and if less than 80% or something of songs have the same artist and there is no album artist set, should we just scrap it and say "Various artists"?
https://github.com/AkaneTan/libPhonograph/blob/f7470b5dbc66858dc9b502a00f382093a70cd584/libPhonograph/src/main/java/uk/akane/libphonograph/reader/Reader.kt#L323

Additional context
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