Fix rendering of backticks in ReactiveHTML

[philippjfr]

Fixes #5500

[codecov]

Codecov Report

Merging #5512 (429b275) into main (1b88afa) will decrease coverage by 11.07%.
The diff coverage is 44.44%.

@@             Coverage Diff             @@
##             main    #5512       +/-   ##
===========================================
- Coverage   83.60%   72.54%   -11.07%     
===========================================
  Files         276      276               
  Lines       40162    40171        +9     
===========================================
- Hits        33579    29141     -4438     
- Misses       6583    11030     +4447     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	72.54% <44.44%> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
panel/tests/ui/test_reactive.py	29.16% <44.44%> (-70.84%)	⬇️

... and 71 files with indirect coverage changes

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