Add option to minimize to tray

[michaelknowles]

Related issue

#350

Context / Background

The issue submitter wants to have the option to either minimize to the taskbar, or minimize to the tray.

What change is being introduced by this PR?

I mirrored the approach used for the close-to-tray feature. An option was added to the preferences with similar wording in the same location. It defaults to true (minimize-to-tray) as this keeps the behavior consistent with before.

How will this be tested?

Tested manually. I didn't see any tests for the similar close-to-tray feature to mirror.

[codecov]

Codecov Report

Merging #394 into main will decrease coverage by 0.02%.
The diff coverage is 14.28%.

@@            Coverage Diff             @@
##             main     #394      +/-   ##
==========================================
- Coverage   56.57%   56.54%   -0.03%     
==========================================
  Files          25       25              
  Lines        2379     2382       +3     
  Branches      402      404       +2     
==========================================
+ Hits         1346     1347       +1     
- Misses        913      914       +1     
- Partials      120      121       +1     

Impacted Files	Coverage Δ
js/main-window.js	0.00% <0.00%> (ø)
js/user-preferences.js	92.52% <100.00%> (+0.07%)	⬆️

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[araujoarthur0]

I like adding more choice to the user.