Slices no longer a loop mode

[djdiskmachine]

Separate slices and loop mode
Enables looped slices, great for amen breaks and other timed loops

Action:
Set instrument number of slices in instrument
Select loop mode other than "none"
Play sample

Expected outcome:
Slice should loop between start offset and next slice start offset

Actual outcome:
Slice plays with "none" loop mode

[djdiskmachine]

Slices were added way back in dec 2022 1cc338d