idle-maint: don't need to change discard_granularity

F2FS changes proper configurations along with gc_urgent, so idle-maint doesn't
need to set this redundantly.

Change-Id: I4a71a5d877a3bb9636e2b65132ec806edc56a8fe
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
1 file changed