fix: max-width for long timezones names

[GretaD]

fixes #6570

to avoid any breaking changes on other parts where ncselect is used, lets force it on calendar

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 23.41%. Comparing base (8f9e504) to head (c27f067).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6613   +/-   ##
=========================================
  Coverage     23.41%   23.41%           
  Complexity      472      472           
=========================================
  Files           249      249           
  Lines         11899    11899           
  Branches       2269     2268    -1     
=========================================
  Hits           2786     2786           
  Misses         8786     8786           
  Partials        327      327           

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php	59.45% <ø> (ø)

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[tcitworld]

I'd scope it into .booking__time-zone to make sure it doesn't affect anything else that would be added afterwards.