LibCore: Don't auto-accept events that hit bubbling limit

We were using the "accept" flag on the event to break out of the
bubbling loop, but this had lasting consequences since all events that
bubbled too far came out looking as if someone had accepted them.

If an event is ignored by everyone, it should appear ignored.

Libraries/LibCore/Object.cpp

@@ -231,8 +231,7 @@ void Object::dispatch_event(Core::Event& e, Object* stay_within)
         target = target->parent();
         if (target == stay_within) {
             // Prevent the event from bubbling any further.
-            e.accept();
-            break;
+            return;
         }
     } while (target && !e.is_accepted());
 }