Fix Settings Panel bug causing frozen overview.

Previously, toggling search panel would freeze Overview mode
until the user exited back to the regular launcher. Also, the current
page would be lost. Fix this by computing the new scroll bounds
immediately when the setting is toggled.

Change-Id: Ib3587cfcea61e15b3d8b280113ce986cc57f2f9d
Merge branch 'cm-11.0' into kk_mkt