refactor: Remove deprecated jitsi call generator

lib/pages/chat/chat.dart

@@ -16,10 +16,8 @@ import 'package:image_picker/image_picker.dart';
 import 'package:matrix/matrix.dart';
 import 'package:record/record.dart';
 import 'package:scroll_to_index/scroll_to_index.dart';
-import 'package:url_launcher/url_launcher.dart';
 import 'package:vrouter/vrouter.dart';
 
-import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/pages/chat/chat_view.dart';
 import 'package:fluffychat/pages/chat/cupertino_widgets_bottom_sheet.dart';
 import 'package:fluffychat/pages/chat/event_info_dialog.dart';
@@ -128,20 +126,6 @@ class ChatController extends State<Chat> {
 
   EmojiPickerType emojiPickerType = EmojiPickerType.keyboard;
 
-  void startCallAction() async {
-    final url =
-        '${AppConfig.jitsiInstance}${Uri.encodeComponent(Matrix.of(context).client.generateUniqueTransactionId())}';
-
-    final success = await showFutureLoadingDialog(
-        context: context,
-        future: () => room!.sendEvent({
-              'msgtype': Matrix.callNamespace,
-              'body': url,
-            }));
-    if (success.error != null) return;
-    await launch(url);
-  }
-
   void requestHistory() async {
     if (canLoadMore) {
       try {
@@ -878,9 +862,6 @@ class ChatController extends State<Chat> {
     if (choice == 'location') {
       sendLocationAction();
     }
-    if (choice == 'videocall') {
-      startCallAction();
-    }
   }
 
   unpinEvent(String eventId) async {