mask now handled in lm

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 87.69231% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 79.52%. Comparing base (d675089) to head (d63cef5).

Files	Patch %	Lines
astrophot/models/group_model_object.py	76.19%	5 Missing :warning:
astrophot/fit/lm.py	92.30%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #175 +/- ## ========================================== + Coverage 79.16% 79.52% +0.36% ========================================== Files 91 91 Lines 7558 7616 +58 ========================================== + Hits 5983 6057 +74 + Misses 1575 1559 -16 ```

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