server/search: fix case in result JSON

server/szurubooru/api/user_api.py

@@ -43,7 +43,7 @@ class UserListApi(BaseApi):
         return {
             'query': query,
             'page': page,
-            'page_size': self._search_executor.page_size,
+            'pageSize': self._search_executor.page_size,
             'total': count,
             'users': [_serialize_user(context.user, user) for user in user_list],
         }

server/szurubooru/tests/api/test_user_api.py

@@ -29,7 +29,7 @@ class TestRetrievingUsers(DatabaseTestCase):
         result = api_.get(self.context)
         self.assertEqual(result['query'], '')
         self.assertEqual(result['page'], 1)
-        self.assertEqual(result['page_size'], 100)
+        self.assertEqual(result['pageSize'], 100)
         self.assertEqual(result['total'], 2)
         self.assertEqual([u['name'] for u in result['users']], ['u1', 'u2'])