Settings: Simplyfiy expanded desktop summary

There is no need to have an extra summary string to display the
state of the expanded desktop mode. This commit removes the unneeded
strings and uses the entries as summary.

Change-Id: Ia7e99ec52577c64d786ef5a0117fb33f5af671ab

Conflicts:
	res/values/strings.xml

 Author:    jackmu95 <jacob.mueller.elz@gmail.com>
 Changes to be committed:
	modified:   res/values/strings.xml
	modified:   src/com/android/settings/cyanogenmod/PowerMenu.java