Fix settings size for chat & tweak msg limit

lib/screens/channel/chat/chat_store.dart

@@ -16,7 +16,7 @@ part 'chat_store.g.dart';
 class ChatStore = _ChatStoreBase with _$ChatStore;
 
 abstract class _ChatStoreBase with Store {
-  static const _messageLimit = 5555;
+  static const _messageLimit = 5000;
 
   /// The provided auth store to determine login status, get the token, and use the headers for requests.
   final AuthStore auth;

lib/screens/channel/video_chat.dart

@@ -56,8 +56,12 @@ class VideoChat extends StatelessWidget {
           tooltip: 'Settings',
           icon: const Icon(Icons.settings),
           onPressed: () => showModalBottomSheet(
+            isScrollControlled: true,
             context: context,
-            builder: (_) => Settings(settingsStore: settingsStore),
+            builder: (_) => SizedBox(
+              height: MediaQuery.of(context).size.height * 0.8,
+              child: Settings(settingsStore: settingsStore),
+            ),
           ),
         ),
       ],