Use MASK_NRM to match AMI data

[rcooper295]

Small addition to automatically set up instrument with NRM for NIRISS AMI exposures. Currently it gets set up with CLEARP, e.g.:

Configured simulation instrument for:
    Instrument: NIRISS
    Filter: F430M
    Detector: NIS
    Apername: NIS_AMI1
    Det. Pos.: (46, 41) in subarray
    Image plane mask: None
    Pupil plane mask: CLEARP

This change results in:

Configured simulation instrument for:
    Instrument: NIRISS
    Filter: F430M
    Detector: NIS
    Apername: NIS_AMI1
    Det. Pos.: (46, 41) in subarray
    Image plane mask: None
    Pupil plane mask: MASK_NRM

[pep8speaks]

Hello @rcooper295, Thank you for submitting the Pull Request !

• In the file webbpsf/match_data.py:

Line 82:37: E261 at least two spaces before inline comment

If you have not done so, please lint your code in accordance with best practices.

[obi-wan76]

This looks good to me. Thanks!