minor update _presets_widget.py

[fdrgsp]

Set the group combobox to the current preset when the widget is created or refreshed.

This is important for PR #144 and #122

[codecov]

Codecov Report

Merging #164 (1bad737) into main (15a35cb) will increase coverage by 0.03%.
The diff coverage is n/a.

❗ Current head 1bad737 differs from pull request most recent head df4ee83. Consider uploading reports for the commit df4ee83 to get more accurate results

@@            Coverage Diff             @@
##             main     #164      +/-   ##
==========================================
+ Coverage   81.83%   81.86%   +0.03%     
==========================================
  Files          26       26              
  Lines        2323     2316       -7     
==========================================
- Hits         1901     1896       -5     
+ Misses        422      420       -2     

Impacted Files	Coverage Δ
micromanager_gui/_core_widgets/_presets_widget.py	83.15% <0.00%> (+0.80%)	⬆️

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[ianhi]

probably good to add a test of this? otherwise looking good

[tlambert03]

looks like this got added also in #167, so will close