Simplify UserPaginator.page_range a bit

Since the minimal value of UserPaginator._current_page is
set in the constructor, we don't need max(..., 1).

users/paginators.py

@@ -16,6 +16,6 @@ def page(self, number):
     @property
     def page_range(self):
         return list(range(
-            max(self._current_page, 1),
+            self._current_page,
             min(self._current_page + self._page_range_size + 1, self.num_pages + 1)
         ))