Fix _disable_native_migrations: only set verbosity=0

[blueyed]

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[codecov-io]

Codecov Report

Merging #730 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #730      +/-   ##
=========================================
+ Coverage    97.9%   97.9%   +<.01%     
=========================================
  Files          32      32              
  Lines        1861    1863       +2     
  Branches      147     147              
=========================================
+ Hits         1822    1824       +2     
  Misses         26      26              
  Partials       13      13

Impacted Files	Coverage Δ
tests/test_db_setup.py	100% <100%> (ø)	⬆️
pytest_django/fixtures.py	96.41% <100%> (+0.03%)	⬆️

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