Fix bug in get_data if data has less than 12 pixel and pixel_mask is set

[samaloney]

Closes #198

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.53%. Comparing base (3c8b7d6) to head (1261b8e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
+ Coverage   81.36%   81.53%   +0.17%     
==========================================
  Files          36       36              
  Lines        2458     2459       +1     
==========================================
+ Hits         2000     2005       +5     
+ Misses        458      454       -4     

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[Copilot]

Pull Request Overview

This PR fixes a bug in the get_data method where applying a pixel mask to data with fewer than 12 pixels would cause a shape mismatch error.

• Fixed pixel mask slicing to handle data with less than 12 pixels
• Added test case for pixel_indices parameter

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
stixpy/product/sources/science.py	Modified pixel mask application to slice the mask to match actual number of pixels in the data
stixpy/product/sources/tests/test_science.py	Added test for get_data with pixel_indices parameter
changelog/200.bugfix.rst	Documented the bug fix in the changelog

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