fix: improve com table display

[gselzer]

On Windows, I've found it a bit tricky to assign COM port properties to devices when using the Hardware Configuration Wizard:

Now, this PR changes the behavior to this:

Note that Qt.WindowType.MSWindowsFixedSizeDialogHint prevents us from resizing that window. I elected to not mess with that here, in favor of just resizing the widget to always fit the whole table, because we're not talking about too many rows for COM/TCP ports. But it's a weak personal preference that I'd be open to changing.

Also, I didn't add a test because I didn't immediately see a way to get access to a COM port, if someone knows how let me know!

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.36%. Comparing base (dbabfa5) to head (1d8e42a).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pymmcore_widgets/hcwizard/_dev_setup_dialog.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #560      +/-   ##
==========================================
- Coverage   88.70%   87.36%   -1.34%     
==========================================
  Files         115      115              
  Lines       13781    14098     +317     
==========================================
+ Hits        12224    12317      +93     
- Misses       1557     1781     +224     

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