Hide overlays over WifiInstaller dialog

Bug: 176756141
Test: manual
Merged-In: Ib4e11c573ddfc782a5068440c4d6ee48378be511
Change-Id: Ib4e11c573ddfc782a5068440c4d6ee48378be511
(cherry picked from commit 0aead2d61a342da96cf51e72774c691dee42719f)
1 file changed