Fix _n_selected_points in _layerlist_context.py

[jwindhager]

Description

While going through the source code, I noticed that _n_selected_points counts the number of labels layers instead of the number of points layers (likely a copy-paste mistake). This minimal PR rectifies that.

Type of change

• Bug-fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

References

None

How has this been tested?

I have NOT tested this.

Final checklist:

• My PR is the minimum possible work for the desired functionality
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• If I included new strings, I have used trans. to make them localizable.
  For more information see our translations guide.

[Czaki]

Thanks for find and fix

[codecov]

Codecov Report

Merging #5450 (068e1da) into main (562cc7f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #5450   +/-   ##
=======================================
  Coverage   89.22%   89.23%           
=======================================
  Files         599      599           
  Lines       50884    50884           
=======================================
+ Hits        45400    45405    +5     
+ Misses       5484     5479    -5     

Impacted Files	Coverage Δ
napari/_app_model/context/_layerlist_context.py	91.13% <100.00%> (ø)
napari/_qt/dialogs/qt_package_installer.py	81.67% <0.00%> (+0.39%)	⬆️
napari/utils/theme.py	92.85% <0.00%> (+0.59%)	⬆️
napari/utils/info.py	81.44% <0.00%> (+1.03%)	⬆️
napari/_qt/__init__.py	56.66% <0.00%> (+6.66%)	⬆️

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