add homebrew location to default DB search path

[antond-weta]

Description

Tests

Checklist:

• I have read the contribution guidelines.
• I have updated the documentation, if applicable. (Check if there is no
  need to update the documentation, for example if this is a bug fix that
  doesn't change the API.)
• I have ensured that the change is tested somewhere in the testsuite
  (adding new test cases if necessary).
• My code follows the prevailing code style of this project. If I haven't
  already run clang-format before submitting, I definitely will look at the CI
  test that runs clang-format and fix anything that it highlights as being
  nonconforming.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.75%. Comparing base (858a405) to head (83459a4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #264      +/-   ##
==========================================
+ Coverage   90.74%   90.75%   +0.01%     
==========================================
  Files          17       17              
  Lines        3435     3439       +4     
  Branches      531      532       +1     
==========================================
+ Hits         3117     3121       +4     
  Misses        318      318              

Files with missing lines	Coverage Δ
src/rawtoaces_core/rawtoaces_core.cpp	98.40% <100.00%> (+<0.01%)	⬆️
src/rawtoaces_util/image_converter.cpp	78.44% <100.00%> (+0.01%)	⬆️

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