Android keyboard: After processing a char event, fall through and also generate a keydown.

Fixes #21309

android/src/org/ppsspp/ppsspp/PpssppActivity.java

@@ -1241,7 +1241,7 @@ public class PpssppActivity extends AppCompatActivity implements SensorEventList
 						Log.i(TAG, "Key char event " + unicode);
 						// Handle alphanumeric character
 						NativeApp.keyChar(NativeApp.DEVICE_ID_KEYBOARD, c);
-						return true;
+						// Note: We also want to generate a KeyDown event with keycode.
 					}
 
 					// Log.i(TAG, "KeyEvent Down");