famistudio_music_pause no longer stops sampled sound effects

[Teuthida255]

Originally, this subroutine's blanket call to famistudio_sample_stop would cause the channel to stop playing even if it was playing a sound effect instead of music; this request adds a brief check to famistudio_dpcm_effect before calling the function to skip it if a sound effect is playing in the channel.

[BleuBleu]

For this to be considered, you would need to :

1. Do all 4 assemblers
2. Run unit test to ensure binary identical engines

-Mat

[BleuBleu]

Im preparing 4.3.1 soon, please address the 2 issues i raised otherwise it will not make it into the release.