Orientation change causes background to not be scrollable. Fixes #604

This fixes a problem where if you have the history pane open and you
change the orientation, then the history list would no longer be
scrollable unless you touch the bubble.

Auditors: @KevinGrandon

Application/LinkBubble/src/main/java/com/linkbubble/ui/CanvasView.java

@@ -238,7 +238,7 @@ private void applyAlpha() {
             mBottomMaskView.animate().alpha(mCurrentAlpha).setDuration(Constant.CANVAS_FADE_ANIM_TIME);
         }
 
-        if (!mEnabled || (mCurrentAlpha == 0.0f && mContentViewY == (int)(mTargetY))) {
+        if (!mEnabled || mCurrentAlpha == 0.0f) {
 
             try {
                 clearFocus();