fix leak in handlerengine test (#48104)

Author: jkarneges

src/handler/handlerenginetest.cpp

@@ -309,6 +309,9 @@ private slots:
 		delete engine;
 		delete wrapper;
 
+		// ensure deferred deletes are processed
+		QCoreApplication::instance()->sendPostedEvents();
+
 		RTimer::deinit();
 		DeferCall::cleanup();
 	}

src/proxy/proxyenginetest.cpp

@@ -635,7 +635,9 @@ private slots:
 		delete domainMap;
 		delete wrapper;
 
+		// ensure deferred deletes are processed
 		QCoreApplication::instance()->sendPostedEvents();
+
 		RTimer::deinit();
 		DeferCall::cleanup();
 	}