Lower log level to debug warning for lock screen not found case

[seanbudd]

Link to issue number:

Closes #14475
Follow up for #14416

Summary of the issue:

#14416 added a log message at exception level.
This log message is for when the relative z-order for an NVDAObject and the lock screen cannot be determined.
While a noisy exception here is useful for alpha/beta testing of this code, this log message is almost always triggered once when locking windows. This is because the lock screen may not exist while windows is in the process of locking.

Description of user facing changes

Lower log level

Description of development approach

n/a

Testing strategy:

n/a

Known issues with pull request:

N/a

Change log entries:

N/a

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
• Security precautions taken.

[seanbudd]

marking this as blocked until there has been sufficient testing of #14416. Once #14416 has been out for 1-2 months we can consider merging.