[pn.Param] type not in widgets => widget is not override

[xavArtley]

Fix; #1377

[codecov]

Codecov Report

Merging #1378 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1378   +/-   ##
=======================================
  Coverage   87.68%   87.68%           
=======================================
  Files         130      130           
  Lines       13927    13928    +1     
=======================================
+ Hits        12212    12213    +1     
  Misses       1715     1715           

Impacted Files	Coverage Δ
panel/param.py	91.55% <100.00%> (+0.01%)	⬆️

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[philippjfr]

Thanks @xavArtley!