Settings: Various updates for PIE (2/2)

Brought over from previous MoKee code, and a lil new improvements

Change-Id: I87eaf67a0221a068542d14afa0d841692c539d78
Settings: Switch to correct immersive mode style when enabling PIE

Change-Id: Ic7f1f31e18db22b0533e7f036f77925fe05de765