[1.8.x] Fixed isort import that's inconsistent between platforms.

Backport of c8e24bbc9b from master

django/db/backends/sqlite3/schema.py

@@ -1,9 +1,8 @@
+import _sqlite3  # isort:skip
 import codecs
 import copy
 from decimal import Decimal
 
-import _sqlite3
-
 from django.apps.registry import Apps
 from django.db.backends.base.schema import BaseDatabaseSchemaEditor
 from django.utils import six