apply theme to edit message

example/lib/main.dart

@@ -59,7 +59,7 @@ class MyApp extends StatelessWidget {
       debugShowCheckedModeBanner: false,
       theme: ThemeData.light(),
       darkTheme: ThemeData.dark(),
-      themeMode: ThemeMode.system,
+      themeMode: ThemeMode.dark,
       onGenerateRoute: AppRoutes.generateRoute,
       initialRoute:
           client.state.user == null ? Routes.CHOOSE_USER : Routes.HOME,

lib/src/message_actions_modal.dart

@@ -273,6 +273,7 @@ class MessageActionsModal extends StatelessWidget {
       elevation: 2,
       clipBehavior: Clip.hardEdge,
       isScrollControlled: true,
+      backgroundColor: StreamChatTheme.of(context).colorTheme.white,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.only(
           topLeft: Radius.circular(32),