fix(liveness): Prevent challenge from restarting

[tylerjroach]

The challenge was starting even before the face was a proper distance away. Before the no-light PR, readyForOval was not set until the initial face distance check had passed. This corrects the previous behavior of no starting the challenge until the face is the correct distance away.

• PR conforms to Pull Request guidelines.

Issue #, if available:

Description of changes:

How did you test these changes?
(Please add a line here how the changes were tested)

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(liveness): message, fix(authenticator): message, fix(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 32.65%. Comparing base (0e9a121) to head (a2342d8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #271   +/-   ##
=======================================
  Coverage   32.64%   32.65%           
=======================================
  Files         100      100           
  Lines        4622     4621    -1     
  Branches      587      587           
=======================================
  Hits         1509     1509           
  Misses       2956     2956           
+ Partials      157      156    -1     

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.