Fixes widget player loop when start is 0

[hoxbro]

Fixes #2140

If default parameters is not set, it sees 0 as Null. Default values are the same as the widgets.

[codecov]

Codecov Report

Merging #2141 (f245398) into master (7410371) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2141      +/-   ##
==========================================
- Coverage   83.82%   83.80%   -0.02%     
==========================================
  Files         182      182              
  Lines       21637    21658      +21     
==========================================
+ Hits        18137    18151      +14     
- Misses       3500     3507       +7     

Impacted Files	Coverage Δ
panel/models/widgets.py	100.00% <100.00%> (ø)
panel/io/notebook.py	54.83% <0.00%> (-2.54%)	⬇️
panel/widgets/slider.py	77.51% <0.00%> (-0.70%)	⬇️
setup.py	0.00% <0.00%> (ø)
panel/models/datetime_picker.py	100.00% <0.00%> (ø)
panel/io/jupyter_server_extension.py	0.00% <0.00%> (ø)
panel/widgets/tables.py	84.18% <0.00%> (+0.32%)	⬆️
panel/reactive.py	75.67% <0.00%> (+0.60%)	⬆️
panel/pane/idom.py	48.83% <0.00%> (+2.55%)	⬆️

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