Added class clearance fixes and improvements

lib/services/data_service/data_service_badges.dart

@@ -52,12 +52,16 @@ extension DataServiceBadges on DataService {
     int offset = 0,
     int limit = 20,
     bool append = false,
+    bool onlyIncomplete = false,
   }) async {
     _isClassClearanceProgressLoading = true;
     if (!append) _classClearanceProgress = [];
     try {
-      final json =
-          await api.get('/badge/completion/class?limit=$limit&offset=$offset');
+      final onlyIncompleteParam =
+          onlyIncomplete ? '&only_incomplete=true' : '';
+      final json = await api.get(
+        '/badge/completion/class?limit=$limit&offset=$offset$onlyIncompleteParam',
+      );
       List<dynamic>? list;
       if (json is List) {
         list = json;