backlight - fix dimming if normal level less than dim level
backlight - fix dimming if normal level less than dim level

if dim level is set to 20% but normal level has been moved to 10%...
when we dim dont RAISE bl level to 20% - do nothing if dim > normal.

tasn/enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,rvandegrift/e,tasn/enlightenment,rvandegrift/e,FlorentRevest/Enlightenment,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,tizenorg/platform.upstream.enlightenment