fix: Allow searching for non-alphanumeric characters

[larseggert]

Fixes #3675

@rjsparks, this avoids us needing to fork list.js. If you prefer a fork, let me
know.

[codecov]

Codecov Report

Merging #4266 (08368f6) into main (fe1f51a) will increase coverage by 0.01%.
The diff coverage is 97.14%.

@@            Coverage Diff             @@
##             main    #4266      +/-   ##
==========================================
+ Coverage   88.40%   88.42%   +0.01%     
==========================================
  Files         294      294              
  Lines       39197    39200       +3     
==========================================
+ Hits        34652    34662      +10     
+ Misses       4545     4538       -7     

Impacted Files	Coverage Δ
ietf/doc/urls.py	100.00% <ø> (ø)
ietf/utils/markdown.py	100.00% <ø> (ø)
ietf/doc/views_draft.py	91.98% <93.75%> (ø)
ietf/doc/views_ballot.py	91.86% <100.00%> (+0.10%)	⬆️
ietf/doc/views_doc.py	90.53% <100.00%> (+0.04%)	⬆️
ietf/doc/views_status_change.py	93.36% <100.00%> (+0.20%)	⬆️
ietf/utils/text.py	87.19% <100.00%> (+1.48%)	⬆️
ietf/utils/mail.py	79.85% <0.00%> (+0.23%)	⬆️
ietf/ietfauth/utils.py	91.97% <0.00%> (+1.23%)	⬆️

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