fixed django middleware: add query to debug log correctly

[florianschieder]

This has likely never worked correctly, as Django's query log entry has ever since been a dictionary made of 'time' and 'sql'. I've locally mounted this sqlcommenter code state into a Django project of ours using assertNumQueries, and it worked, see output below. The queries are properly formatted into the connection debug log:

File "(...)/tests/test_dummy.py", line 7, in test_dummy
    with self.assertNumQueries(0):
         ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/django/test/testcases.py", line 96, in __exit__
    self.test_case.assertEqual(
AssertionError: 2 != 0 : 2 queries executed, 0 expected
Captured queries were:
1. 
            SELECT [...]
            WHERE foo IN (1, 2, 3) /*controller='django_app.views.SomeView',framework='django%%3A5.0.11',route='SOME_SLUG'*/
[...]

Fixes #2.