fixed bug with disabling overlay buttons during screen keyboard on Android

fixed bug with disabling overlay buttons during screen keyboard on Android

When using the screen keyboard on Android systems with touch input,
keys on the screen keyboard like the "Return" key are handled as key
events, not text events, This causes the event handler to think that
a real keyboard is used instead of touch input, causing overlay touch
buttons to be disabled, even if the screen keyboard is immediately
followed by a request dialog, where overlay buttons should be used.