Fix for navigator object highlighting activation

[CyrilleB79]

Link to issue number:

None

Summary of the issue:

When activating Highlight of navigator object, the highlighting rectangle does not show up. It only shows up when the navigator object is moved for the first time. If the highlight of nav object is previously disabled, the issue occurs for all the four following types of activation:

1. When checking the corresponding checkbox in the vision parameters
2. When you reload NVDA's saved config provided that highlighter is enabled in NVDA's saved config.
3. When activating with a gesture a profile containing nav object highlight enabled
4. When NVDA starts up if the default config has nav object highlight enabled

Description of how this pull request fixes the issue:

Checks nav object initialization when the providers are initialized. Prior to this PR, only the focus initialization was checked (and the caret thanks to it).

Testing strategy:

Manually tested the 4 cases described in the section "Summary of the issue".
All successful.
Test 3 successful provided that you are not in the case described in #13640.

Known issues with pull request:

Test 3 may fail due to #13640. But it works once you have executed the whole STR of #13640.

Change log entries:

Bug fixes
Navigator object highlighting now shows up immediately upon activation of the feature.

Code Review Checklist:

• Pull Request description:
  • description is up to date
  • change log entries
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• API is compatible with existing add-ons.
• Documentation:
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English

[AppVeyorBot]

• FAIL: System tests. See test results for more information.
• PASS: Lint check.
• Build (for testing PR): https://ci.appveyor.com/api/buildjobs/2legehd3pxkgrx46/artifacts/output/nvda_snapshot_pr13641-25307,6ca5e5b7.exe
• PASS: Translation comments check.
• PASS: Unit tests.

See test results for failed build of commit 6ca5e5b796