android: hide keyboard on scrolling at a more correct location

When animation happens the scrollbars appear. This hides the
keyboard when the user types and the viewport is repositioned.
With this change, trigger the keyboard hiding only when we really
do scrolling (panning).

Change-Id: I17dc651a6641e807a386d5184868412dd6710a28

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/JavaPanZoomController.java

@@ -418,6 +418,7 @@ public class JavaPanZoomController
         } else {
             setState(PanZoomState.PANNING);
         }
+        LibreOfficeMainActivity.mAppContext.hideSoftKeyboard();
     }
 
     private float panDistance(MotionEvent move) {

android/experimental/LOAndroid3/src/java/org/mozilla/gecko/gfx/ScrollbarLayer.java

@@ -208,8 +208,6 @@ public class ScrollbarLayer extends TileLayer {
         mOpacity = 1.0f;
         endTransaction();
 
-        // Scrollbar is now visible, scrolling will start: hide the soft keyboard.
-        LibreOfficeMainActivity.mAppContext.hideSoftKeyboard();
         return true;
     }