output_path passed to mast_retrieve_opd() when default choice=='closest'

[rcooper295]

Fix to minor issue where the output_path kwarg is not carried through to mast_retrieve_opd() from get_opd_at_time() when choice=='closest', which is the default. This causes a permission error when the user doesn't have write permissions to $WEBBPSF_PATH.

[codecov[bot]]

Codecov Report

Base: 62.28% // Head: 62.28% // No change to project coverage :thumbsup:

Coverage data is based on head (241014d) compared to base (89da8da). Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #563   +/-   ##
========================================
  Coverage    62.28%   62.28%           
========================================
  Files           13       13           
  Lines         5293     5293           
========================================
  Hits          3297     3297           
  Misses        1996     1996           

Impacted Files	Coverage Δ
webbpsf/mast_wss.py	9.60% <ø> (ø)

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