Revert "remove ui sound dir on boot if exists"

This reverts commit f1d726570d4a77350a721d6edf23a20363b6b42d.

fixed upstream by
http://review.cyanogenmod.org/#/c/49708/
http://review.cyanogenmod.org/#/c/49774/
http://review.cyanogenmod.org/#/c/49707/