Fix plot 2d

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 346 lines in your changes missing coverage. Please review.

Project coverage is 30.14%. Comparing base (6cc34a8) to head (2aba093). Report is 9 commits behind head on main.

Files	Patch %	Lines
polartools/hkl_utils.py	0.00%	327 Missing :warning:
polartools/diffraction.py	0.00%	19 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #81 +/- ## ========================================== - Coverage 33.02% 30.14% -2.89% ========================================== Files 11 11 Lines 1935 2120 +185 ========================================== Hits 639 639 - Misses 1296 1481 +185 ```

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