tests: fix test_sqlite_database_renamed for Django 1.11

[blueyed]

Ref: https://github.com/django/django/blob/1.11.20/django/db/backends/sqlite3/creation.py#L19
Fixes #712.

[codecov-io]

Codecov Report

Merging #739 into master will increase coverage by 0.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #739      +/-   ##
==========================================
+ Coverage    97.9%   98.06%   +0.16%     
==========================================
  Files          32       32              
  Lines        1863     1863              
  Branches      147      147              
==========================================
+ Hits         1824     1827       +3     
+ Misses         26       24       -2     
+ Partials       13       12       -1

Impacted Files	Coverage Δ
tests/test_db_setup.py	100% <ø> (ø)	⬆️
pytest_django/live_server_helper.py	96.87% <0%> (+4.68%)	⬆️

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