Refresh menu bar to new current unit when new tab is selected

[pavelbraginskiy]

You can't switch unit type to the unit type of the current unit, but if the menu bar isn't refreshed, it'll use the unit type of the first unit, not the current unit, to determine which unit kind you can't switch to.

Refreshing the menu bar when you switch to a new tab solves this (and likely some other problems as well).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 2.13%. Comparing base (b4ceda1) to head (5875756).
Report is 16 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##             master   #1684      +/-   ##
===========================================
- Coverage      2.13%   2.13%   -0.01%     
  Complexity      209     209              
===========================================
  Files           270     271       +1     
  Lines         31350   31368      +18     
  Branches       5337    5339       +2     
===========================================
  Hits            670     670              
- Misses        30523   30541      +18     
  Partials        157     157              

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[Sleet01]

LGTM!