added clear message for denied camera or gallery access

lib/view/pages/talk/widgets/chat_textfield.dart

@@ -164,7 +164,7 @@ class _ChatTextfieldState extends State<ChatTextfield> {
           leading: const Icon(Icons.image),
           title: const Text('Aus Galerie auswählen'),
           onTap: () {
-            FilePick.multipleGalleryPick().then((value) {
+            FilePick.multipleGalleryPick(context).then((value) {
               if (value != null) {
                 mediaUpload(value.map((e) => e.path).toList());
               }
@@ -176,7 +176,7 @@ class _ChatTextfieldState extends State<ChatTextfield> {
           leading: const Icon(Icons.camera_alt_outlined),
           title: const Text('Foto aufnehmen'),
           onTap: () {
-            FilePick.cameraPick().then((image) {
+            FilePick.cameraPick(context).then((image) {
               if (image != null) mediaUpload([image.path]);
             });
             Navigator.of(sheetCtx).pop();