Ensure convert respects pn.config

[philippjfr]

Fixes #4357

[codecov]

Codecov Report

Merging #4359 (b787d19) into main (1237917) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #4359   +/-   ##
=======================================
  Coverage   82.78%   82.79%           
=======================================
  Files         240      240           
  Lines       34631    34637    +6     
=======================================
+ Hits        28670    28677    +7     
+ Misses       5961     5960    -1     

Flag	Coverage Δ
ui-tests	38.32% <100.00%> (+0.05%)	⬆️
unitexamples-tests	73.75% <0.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
panel/io/convert.py	72.00% <100.00%> (+0.11%)	⬆️
panel/tests/ui/io/test_convert.py	95.86% <100.00%> (+0.17%)	⬆️
panel/util/__init__.py	87.11% <0.00%> (+0.44%)	⬆️

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