Fix the icon size in app lists.

E.g. the "Select app" dialog in the profile group configuration uses
this layout to inflate the list dialog. However app icons can have
non-standard sizes so we enforce a consistent width and height.

Change-Id: I71731a9bb3548c699cc2e0e600a5ff371ceacbc3
Merge "Fix the icon size in app lists." into cm-11.0
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_packages_apps_Settings into cd-4.4