QmlDesigner: Fix warning about unused parameters

Change-Id: Ia244ae89613e67d7baede8b3e55b0ca981e60056
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/qmldesigner/components/contentlibrary/contentlibrarytexturesmodel.cpp

@@ -179,6 +179,7 @@ void ContentLibraryTexturesModel::resetModel()
 
 void ContentLibraryTexturesModel::addToProject(const QString &mat)
 {
+    Q_UNUSED(mat)
     // TODO: import asset
 }
 

src/plugins/qmldesigner/components/itemlibrary/itemlibraryview.cpp

@@ -148,6 +148,7 @@ void ItemLibraryView::updateImport3DSupport(const QVariantMap &supportMap)
         AddResourceOperation import3DModelOperation = [this](const QStringList &fileNames,
                                                              const QString &defaultDir,
                                                              bool showDialog) -> AddFilesResult {
+            Q_UNUSED(showDialog)
             auto importDlg = new ItemLibraryAssetImportDialog(fileNames, defaultDir,
                                                               m_importableExtensions3DMap,
                                                               m_importOptions3DMap, {}, {},