Fix alertDialogTheme in Theme.AppCompat.Light
Fix alertDialogTheme in Theme.AppCompat.Light

It was still pointing to the full dialog theme,
rather than the ThemeOverlay like the dark variant.

BUG: 30503352
Change-Id: I30ab2fae2102143a7105ac1832031779fc3ab650

androidx/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,aosp-mirror/platform_frameworks_support,aosp-mirror/platform_frameworks_support,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,aosp-mirror/platform_frameworks_support,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,aosp-mirror/platform_frameworks_support