Android: Close the keyboard after clicking Done

The keyboard was not hiding after clicking the done button.
This commit changes this behavior. If KeyCode is other than
IME_ACTION_PREVIOUS/IME_ACTION_NEXT the keyboard closes automatically.

Fixes: QTBUG-107662
Pick-to: 6.2 6.4
Change-Id: I3449aa6898b826bfa03104275c7224329f24ed9a
Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>

src/android/jar/src/org/qtproject/qt/android/QtInputConnection.java

@@ -253,6 +253,7 @@ public class QtInputConnection extends BaseInputConnection
                     return super.sendKeyEvent(fakeEvent);
 
                 default:
+                   QtNative.activityDelegate().hideSoftwareKeyboard();
                    break;
             }
         }