Allow navigating FileSelector with double click

[philippjfr]

Fixes #1186

[codecov]

Codecov Report

Attention: Patch coverage is 89.61039% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 81.51%. Comparing base (7377c9e) to head (66d8433).
Report is 4 commits behind head on main.

Files	Patch %	Lines
panel/widgets/file_selector.py	80.00%	5 Missing ⚠️
panel/widgets/select.py	85.00%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6843   +/-   ##
=======================================
  Coverage   81.51%   81.51%           
=======================================
  Files         318      318           
  Lines       46709    46776   +67     
=======================================
+ Hits        38076    38131   +55     
- Misses       8633     8645   +12     

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