fix: wrong warning when the project is based on Qt6

src/projectManager.cpp

@@ -220,7 +220,7 @@ bool ProjectManager::runProject(const QString &projectPath)
     }
 
     const QStringList importPaths = getImportPaths(projectPath, qmlProjectFileContent);
-    if (isQt6Project(qmlProjectFileContent)) {
+    if (!isQt6Project(qmlProjectFileContent)) {
         qWarning() << "This is not a Qt6 project.\nQt5 projects might work, but they are not "
                       "officially supported.";
     }