Hide overlays over WifiInstaller dialog Bug: 176756141 Test: manual Merged-In: Ib4e11c573ddfc782a5068440c4d6ee48378be511 Change-Id: Ib4e11c573ddfc782a5068440c4d6ee48378be511 (cherry picked from commit 0aead2d61a342da96cf51e72774c691dee42719f)