Ensure location.unsync unsets query params

[philippjfr]

Fixes #3795

[codecov]

Codecov Report

Merging #3806 (4d66196) into master (5f330f2) will increase coverage by 0.00%.
The diff coverage is 95.45%.

@@           Coverage Diff           @@
##           master    #3806   +/-   ##
=======================================
  Coverage   82.97%   82.98%           
=======================================
  Files         221      221           
  Lines       32205    32206    +1     
=======================================
+ Hits        26723    26726    +3     
+ Misses       5482     5480    -2     

Flag	Coverage Δ
ui-tests	34.14% <0.00%> (-0.03%)	⬇️
unitexamples-tests	75.44% <95.45%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
panel/io/location.py	82.87% <91.66%> (-0.11%)	⬇️
panel/tests/io/test_location.py	100.00% <100.00%> (ø)
panel/io/reload.py	69.56% <0.00%> (-2.18%)	⬇️
panel/tests/command/test_serve.py	83.54% <0.00%> (-1.46%)	⬇️
panel/tests/util.py	86.00% <0.00%> (-1.13%)	⬇️
panel/util.py	87.16% <0.00%> (-0.38%)	⬇️
panel/io/state.py	70.27% <0.00%> (-0.22%)	⬇️
panel/io/jupyter_server_extension.py	0.00% <0.00%> (ø)
panel/tests/ui/widgets/test_tabulator.py	98.97% <0.00%> (+0.11%)	⬆️
panel/pane/idom.py	28.36% <0.00%> (+0.19%)	⬆️
... and 2 more

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