Move macOS benchmarking to NSApp rendering loop, makes example windows visible vs. headless

examples/triangle/triangle.cpp

@@ -1256,7 +1256,7 @@ int main(const int argc, const char *argv[])
 		vulkanExample->setupWindow(nullptr);
 		vulkanExample->prepare();
 		vulkanExample->renderLoop();
-		delete(vulkanExample);			// SRS - handle benchmarking case, normally deleted by applicationWillTerminate() event handler
+		delete(vulkanExample);
 	}
 	return 0;
 }