Revert "Dim icons when recent apps category is disabled"

This change makes all the icons in the system dimmed, not only on Location Settings page. I haven't managed to find a simple fix to that problem. I think we should abandon this feature, and revert this CL.

This reverts commit ebcd196a.

Change-Id: If39f2892c82643b936d2d9ff7b1d1c027018f3f6