Replace dict(<generator expression>) with dictionary comprehension

[jdufresne]

No description provided.

[codecov]

Codecov Report

Merging #935 into master will not change coverage.
The diff coverage is 75%.

@@           Coverage Diff           @@
##           master     #935   +/-   ##
=======================================
  Coverage   83.25%   83.25%           
=======================================
  Files          31       31           
  Lines        1660     1660           
  Branches      246      246           
=======================================
  Hits         1382     1382           
  Misses        199      199           
  Partials       79       79

Impacted Files	Coverage Δ
debug_toolbar/panels/sql/tracking.py	81.44% <0%> (ø)	⬆️
debug_toolbar/panels/sql/panel.py	63.75% <100%> (ø)	⬆️
debug_toolbar/utils.py	83.73% <100%> (ø)	⬆️

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[matthiask]

Thanks!