Fix the time displayed in the tray icon

[Wikiwix]

Issue: closes #1504

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.

• issue was opened to discuss proposed changes before starting implementation. It is important do discuss changes before implementing them (Why should we add it? How should it work? How should it look? Where will it be? ...).
  See Recreate time in tray images #1502 (comment)
• during development, node version specified in package.json was used (ie using nvm).
• package versions and package-lock.json were not changed (npm install --no-save).
• app version number was not changed.
• all new code has tests to ensure against regressions.
• npm run lint reports no offenses.
• npm run test is error-free.
• README and CHANGELOG were updated accordingly.
• after PR is approved, all commits in it are squashed

Description of the Change

• Take the break notification time into account for the time in the tray
• Move the timeToNextBreak logic into a separate getter that is used everywhere this time is displayed (saves some lines of code)
• Use rounded time for the tray icon (to align with the tooltip), and add an additional unit test for this

Verification Process

Ran the software with the changes for some time

Other information

First discussed here

[codecov]

Codecov Report

Attention: Patch coverage is 9.09091% with 10 lines in your changes missing coverage. Please review.

Project coverage is 14.88%. Comparing base (a790f12) to head (f32b922).
Report is 2 commits behind head on trunk.

Files with missing lines	Patch %	Lines
app/breaksPlanner.js	0.00%	7 Missing ⚠️
app/utils/statusMessages.js	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk    #1505      +/-   ##
==========================================
+ Coverage   14.75%   14.88%   +0.13%     
==========================================
  Files          30       30              
  Lines        1925     1921       -4     
==========================================
+ Hits          284      286       +2     
+ Misses       1641     1635       -6     

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[hovancik]

Nice catch, many thanks!