fix my courses

apps/course/views/course.py

@@ -140,7 +140,7 @@ class MyCourseListAPIView(ListAPIView):
         qs = queryset.filter(participants__student=student)
         completed_only = filters.get('completed', '').lower() == 'true'
         if completed_only:
-            queryset = queryset.annotate(
+            queryset = qs.annotate(
                 total_lessons=Count('lessons', distinct=True),
                 completed_lessons=Count(
                     'lessons__completions',
@@ -149,11 +149,11 @@ class MyCourseListAPIView(ListAPIView):
                 )
             ).filter(total_lessons=F('completed_lessons'))
         if certificate := filters.get('certificate', '').lower() == 'true':
-            queryset = queryset.exclude(
+            queryset = qs.exclude(
                 course_certificates__student=student,
                 course_certificates__status__in=['pending', 'approved']
             )
-        return queryset
+        return qs