Revert "Set bg app limit to half of default"

This reverts commit cd6c081ef1977675a6661350548e2d292b162b93.

This prop doesn't exist in CM tree AFAIC.
Merge branch 'cm-11.0' of https://github.com/Mustaavalkosta/android_device_htc_msm7x30-common into cd-4.4