fix: Preserve remote_instructions and short name in secr.sreq.edit()

[jennifer-richards]

Fixes #3710

[codecov]

Codecov Report

Merging #5113 (491b3a1) into main (bfe25fc) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5113      +/-   ##
==========================================
- Coverage   88.50%   88.49%   -0.01%     
==========================================
  Files         296      295       -1     
  Lines       40018    40016       -2     
==========================================
- Hits        35416    35412       -4     
- Misses       4602     4604       +2     

Impacted Files	Coverage Δ
ietf/meeting/views.py	90.70% <100.00%> (+<0.01%)	⬆️
ietf/secr/sreq/forms.py	98.31% <100.00%> (+0.03%)	⬆️
ietf/secr/sreq/views.py	91.16% <100.00%> (-0.40%)	⬇️
ietf/submit/checkers.py	73.60% <0.00%> (-3.05%)	⬇️
ietf/nomcom/utils.py	91.30% <0.00%> (-0.73%)	⬇️
ietf/doc/views_search.py	89.23% <0.00%> (-0.21%)	⬇️

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