dnn: fix LayerFactory initialization

samples/dnn/ssd_object_detection.cpp

@@ -62,8 +62,6 @@ int main(int argc, char** argv)
         return 0;
     }
 
-    cv::dnn::initModule();          //Required if OpenCV is built as static libs
-
     String modelConfiguration = parser.get<string>("proto");
     String modelBinary = parser.get<string>("model");