refactor(files): remove custom page title handling

This conflicts with what `NcAppContent` is already doing.
So we should just remove it.

Signed-off-by: Ferdinand Thiessen <[email protected]>

Author: susnux

apps/files/src/views/FilesList.vue

@@ -479,13 +479,6 @@ export default defineComponent({
 	},
 
 	watch: {
-		/**
-		 * Update the window title to match the page heading
-		 */
-		pageHeading() {
-			document.title = `${this.pageHeading} - ${getCapabilities().theming?.name ?? 'Nextcloud'}`
-		},
-
 		/**
 		 * Handle rendering the custom empty view
 		 * @param show The current state if the custom empty view should be rendered