QmlJsTools: Fix typo in comment

Change-Id: I51cf21704c8a2b7ff8217aaf189a7ca66c2f24a6
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@theqtcompany.com>

src/plugins/qmljstools/qmljsmodelmanager.cpp

@@ -264,7 +264,7 @@ ModelManagerInterface::WorkingCopy ModelManager::workingCopyInternal() const
 
 void ModelManager::updateDefaultProjectInfo()
 {
-    // needs to be performed in the ui therad
+    // needs to be performed in the ui thread
     ProjectExplorer::Project *currentProject = ProjectExplorer::ProjectTree::currentProject();
     ProjectInfo newDefaultProjectInfo = projectInfo(currentProject,
                                                     defaultProjectInfoForProject(currentProject));