Do not enter edit mode when opening a .qmlproject as QDS

If the user opens a .qmlproject in QDS mode we do not want to
enter the edit mode by default.
We check the startup project after opening and calling
openEditMode() will determine if we keep the default of opening
the edit mode or not.

Change-Id: Ic8a7fbefa007d487ec680099544c07fe007c0b29
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/qmlprojectmanager/qmlproject.cpp

@@ -456,6 +456,11 @@ Tasks QmlProject::projectIssues(const Kit *k) const
     return result;
 }
 
+bool QmlProject::isEditModePreferred() const
+{
+    return !isQtDesignStudio();
+}
+
 Project::RestoreResult QmlProject::fromMap(const QVariantMap &map, QString *errorMessage)
 {
     RestoreResult result = Project::fromMap(map, errorMessage);