fix(files): use the correct theming instance name from capabilities to set the page title

Signed-off-by: Julien Veyssier <julien-nc@posteo.net>

Author: julien-nc

apps/files/src/views/FilesList.vue

@@ -443,7 +443,7 @@ export default defineComponent({
 		 * Update the window title to match the page heading
 		 */
 		pageHeading() {
-			document.title = `${this.pageHeading} - ${getCapabilities().theming?.productName ?? 'Nextcloud'}`
+			document.title = `${this.pageHeading} - ${getCapabilities().theming?.name ?? 'Nextcloud'}`
 		},
 
 		/**