Fixing sampler instrument "cutoff attack target" label
Fixing sampler instrument "cutoff attack target" label

This labeling was added for synth instruments in commit
cf1edd917058fc821af38363674da61a472a6a57 but was accidentally
not added for sampler instruments as well.

This only affected the UI labeling - the underlaying instruments
appear to both use the same filter envelope logic behind the
scenes.

jstrait/jssynth,jstrait/jssynth