Fix EditableSlider updates when no value_throttled is set

[philippjfr]

Fixes #3371

[codecov]

Codecov Report

Merging #3387 (bd944a7) into master (d1385fb) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3387      +/-   ##
==========================================
- Coverage   82.95%   82.93%   -0.03%     
==========================================
  Files         198      198              
  Lines       26982    26980       -2     
==========================================
- Hits        22384    22376       -8     
- Misses       4598     4604       +6     

Impacted Files	Coverage Δ
panel/widgets/slider.py	84.10% <0.00%> (-0.75%)	⬇️
panel/io/reload.py	69.56% <0.00%> (-2.18%)	⬇️
panel/tests/command/test_serve.py	83.54% <0.00%> (-1.46%)	⬇️
panel/io/state.py	69.11% <0.00%> (-0.23%)	⬇️
panel/io/server.py	78.09% <0.00%> (-0.22%)	⬇️
panel/pane/idom.py	27.40% <0.00%> (+0.20%)	⬆️
panel/io/callbacks.py	75.93% <0.00%> (+0.56%)	⬆️

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