QmlProject: Fix debugging

Don't always use the mixed engine for debugging of .qmlprojects.
This is a regression from fix fe8cead2.

Change-Id: I589cb0610d40edc4fbd29897374d83504e574cb5
Reviewed-by: Aurindam Jana <aurindam.jana@nokia.com>

src/plugins/qmlprojectmanager/qmlprojectruncontrol.cpp

@@ -216,6 +216,11 @@ RunControl *QmlProjectRunControlFactory::createDebugRunControl(QmlProjectRunConf
     params.displayName = runConfig->displayName();
     params.projectSourceDirectory = runConfig->target()->project()->projectDirectory();
     params.projectSourceFiles = runConfig->target()->project()->files(Project::ExcludeGeneratedFiles);
+    if (runConfig->useQmlDebugger())
+        params.languages |= Debugger::QmlLanguage;
+    if (runConfig->useCppDebugger())
+        params.languages |= Debugger::CppLanguage;
+
     if (!runConfig->qtVersion()->qtAbis().isEmpty())
         params.toolChainAbi = runConfig->qtVersion()->qtAbis().first();