Try to load API key only when needed

[chidiwilliams]

No description provided.

[codecov]

Codecov Report

Merging #420 (b97c615) into main (bf76627) will decrease coverage by 0.12%.
The diff coverage is 88.23%.

❗ Current head b97c615 differs from pull request most recent head 76b1d75. Consider uploading reports for the commit 76b1d75 to get more accurate results

@@            Coverage Diff             @@
##             main     #420      +/-   ##
==========================================
- Coverage   81.03%   80.91%   -0.12%     
==========================================
  Files          25       25              
  Lines        2151     2148       -3     
==========================================
- Hits         1743     1738       -5     
- Misses        408      410       +2     

Flag	Coverage Δ
Linux	80.91% <88.23%> (+0.11%)	⬆️
Windows	?
macOS	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
buzz/gui.py	79.08% <75.00%> (+0.21%)	⬆️
buzz/store/keyring_store.py	78.94% <100.00%> (-2.01%)	⬇️
buzz/widgets/general_preferences_widget.py	86.20% <100.00%> (+0.49%)	⬆️
buzz/widgets/preferences_dialog.py	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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