Delete note when source has more than 4 or more WFC type of HS

[dudehacker]

the notes in target diff is 2, source has WFC(soft) and F(drum) . after copy the 2 notes are deleted

[dudehacker]

the exact cause is when you have 4 WFC type hitsound in your source diff.

workaround: change your 2nd sampleset into named hitsound.

[dudehacker]

Do not support this style of hitsounding as it involves more than 1 sampleset and makes checking harder with no real benefit