Add missing end tag in Templates

[MarcSkovMadsen]

Fixes a template that looks like

If this could be a part of Panel 0.11.2 it would be much appreciated :-)

[codecov]

Codecov Report

Merging #2121 (a6aa87e) into master (58be9f7) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2121      +/-   ##
==========================================
- Coverage   84.43%   84.39%   -0.04%     
==========================================
  Files         181      181              
  Lines       21151    21151              
==========================================
- Hits        17858    17850       -8     
- Misses       3293     3301       +8     

Impacted Files	Coverage Δ
panel/tests/pane/test_base.py	88.23% <0.00%> (-11.77%)	⬇️
panel/io/reload.py	64.36% <0.00%> (-2.30%)	⬇️
panel/pane/base.py	87.89% <0.00%> (-0.90%)	⬇️

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