Add real defaults for configuration

[hubdotcom]

as per https://github.com/jazzband/django-debug-toolbar/blob/ab08d14e3bf03a18a2d828d70f18baf98f64efea/debug_toolbar/settings.py

[codecov]

Codecov Report

Merging #1398 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1398   +/-   ##
=======================================
  Coverage   87.88%   87.88%           
=======================================
  Files          29       29           
  Lines        1576     1576           
  Branches      221      221           
=======================================
  Hits         1385     1385           
  Misses        141      141           
  Partials       50       50           

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[matthiask]

Thanks!