Design tweak: text colors in TextInputDialog.
Design tweak: text colors in TextInputDialog.

Bug: T201030
Change-Id: Ib1e697742469d5e23077850d7a748d9be4493711

wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia