fix(nomcom-ui): Use pre instead of relying on now-missing pasted styling

[rjsparks]

Note that the nomcom decrypt templatetag already aggressively escapes.

Somewhere along the way, the pasted class seems to have been abandoned - there is no styling for it, and nothing tries to select for it in code. Should we just remove the class at this point (this PR changes the last of the places where we were relying on its styling back to use <pre> instead.

corrects the newline part of #4634

[codecov]

Codecov Report

Merging #4658 (2030e27) into main (d34e88d) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #4658      +/-   ##
==========================================
- Coverage   88.43%   88.40%   -0.03%     
==========================================
  Files         296      296              
  Lines       39716    39730      +14     
==========================================
+ Hits        35122    35123       +1     
- Misses       4594     4607      +13     

Impacted Files	Coverage Δ
ietf/utils/timezone.py	91.17% <100.00%> (+6.17%)	⬆️
ietf/doc/views_search.py	88.81% <0.00%> (-1.45%)	⬇️
ietf/utils/text.py	85.97% <0.00%> (-1.22%)	⬇️
ietf/group/utils.py	93.72% <0.00%> (-0.90%)	⬇️
ietf/utils/mail.py	79.62% <0.00%> (-0.47%)	⬇️
ietf/submit/forms.py	82.70% <0.00%> (-0.18%)	⬇️
ietf/nomcom/utils.py	91.50% <0.00%> (+0.24%)	⬆️

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