QmlDesigner: Rename qmldir to qmldir.tpl to avoid error

The qmldir file breaks detailsPage.qml for Qt 6.8.

Task-number: QDS-13209
Change-Id: I39f17b5d544523d067542a09af84c46b9b69b44c
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

share/qtcreator/qmldesigner/studio_templates/projects/application-mcu/wizard.json

@@ -153,7 +153,7 @@
                     "target": "%{ProjectDirectory}/%{MainQmlFileName}"
                 },
                 {
-                    "source": "qmldir",
+                    "source": "qmldir.tpl",
                     "target": "%{ProjectDirectory}/imports/Constants/qmldir"
                 },
                 {