don't hang if somehow setting display plugin to the current one

libraries/display-plugins/src/display-plugins/OpenGLDisplayPlugin.cpp

@@ -170,11 +170,11 @@ public:
                             glFinish();
                         }
                         currentPlugin = newPlugin;
+                    }
                     _newPluginQueue.pop();
                     _condition.notify_one();
                 }
             }
-            }
 
             // If there's no active plugin, just sleep
             if (currentPlugin == nullptr) {