Fixes for jslinking HoloViews components

[philippjfr]

Fixes #603

[codecov]

Codecov Report

Merging #3165 (f9c6443) into master (24e0c15) will increase coverage by 0.37%.
The diff coverage is 78.43%.

@@            Coverage Diff             @@
##           master    #3165      +/-   ##
==========================================
+ Coverage   82.98%   83.35%   +0.37%     
==========================================
  Files         192      196       +4     
  Lines       25500    26526    +1026     
==========================================
+ Hits        21161    22111     +950     
- Misses       4339     4415      +76     

Impacted Files	Coverage Δ
panel/io/datamodel.py	43.75% <ø> (-4.17%)	⬇️
panel/pane/holoviews.py	79.24% <20.00%> (-0.63%)	⬇️
panel/links.py	85.02% <92.10%> (-0.60%)	⬇️
panel/reactive.py	77.24% <100.00%> (+0.95%)	⬆️
panel/tests/test_links.py	98.90% <100.00%> (ø)
panel/io/__init__.py	86.66% <0.00%> (-5.00%)	⬇️
panel/depends.py	80.51% <0.00%> (-3.31%)	⬇️
panel/io/profile.py	23.40% <0.00%> (-2.13%)	⬇️
panel/widgets/input.py	94.18% <0.00%> (-2.12%)	⬇️
... and 56 more

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