chore: Follow up subtitle font style

lib/config/themes.dart

@@ -102,9 +102,6 @@ abstract class FluffyThemes {
           systemNavigationBarColor: colorScheme.surface,
         ),
       ),
-      listTileTheme: ListTileThemeData(
-        subtitleTextStyle: TextStyle(color: colorScheme.outline, fontSize: 14),
-      ),
       outlinedButtonTheme: OutlinedButtonThemeData(
         style: OutlinedButton.styleFrom(
           side: BorderSide(

lib/pages/chat/chat_app_bar_title.dart

@@ -78,10 +78,10 @@ class ChatAppBarTitle extends StatelessWidget {
                               builder: (context, presence) {
                                 final lastActiveTimestamp =
                                     presence?.lastActiveTimestamp;
-                                final style = Theme.of(context)
-                                    .listTileTheme
-                                    .subtitleTextStyle
-                                    ?.copyWith(fontSize: 12);
+                                final style = TextStyle(
+                                  fontSize: 12,
+                                  color: Theme.of(context).colorScheme.outline,
+                                );
                                 if (presence?.currentlyActive == true) {
                                   return Text(
                                     L10n.of(context).currentlyActive,