updated project linter-rules and enforced them

lib/view/pages/more/roomplan/roomplan.dart

@@ -8,10 +8,10 @@ class Roomplan extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: const Text("Raumplan"),
+        title: const Text('Raumplan'),
       ),
       body: PhotoView(
-        imageProvider: Image.asset("assets/img/raumplan.jpg").image,
+        imageProvider: Image.asset('assets/img/raumplan.jpg').image,
         minScale: 0.5,
         maxScale: 2.0,
         backgroundDecoration: BoxDecoration(color: Theme.of(context).colorScheme.background),