Fix issue #22460110: AssistStructure.ViewNode.isAssistBlocked() always...

...returns true

Well it wasn't *quite* always, but close enough. :p

Change-Id: I990b8b2ca7b80ce68a067b0dd92efc1c2faaa8cd

core/java/android/app/assist/AssistStructure.java

@@ -812,7 +812,7 @@ public class AssistStructure implements Parcelable {
          * Returns true if assist data has been blocked starting at this node in the hierarchy.
          */
         public boolean isAssistBlocked() {
-            return (mFlags&ViewNode.FLAGS_ASSIST_BLOCKED) == 0;
+            return (mFlags&ViewNode.FLAGS_ASSIST_BLOCKED) != 0;
         }
 
         /**