flake8 fixes

Author: Obada Haddad

src/apps/api/pagination.py

@@ -49,7 +49,7 @@ def get_page_size(self, request):
             val = int(raw)
         except (TypeError, ValueError):
             return self.page_size
-    
+
         if val in (50, 100, 500):
             return min(val, self.max_page_size)
         return self.page_size