Trebuchet : Don't hideoutlines if in small overview mode

Repro :

Long press homescreen
Observe the gradient backing of each panel
Long press a panel/screen and drop it or rearrange it
Notice the lack of gradient backing

Change-Id: Icac625d8fa11f4751c8dbe775edc5e6093e1a4ed
Merge "Trebuchet : Don't hideoutlines if in small overview mode" into cm-11.0