Fix PositiveRecall optimization in AutoMLExperiment

[JoshuaSloan]

BinaryClassificationMetric.PositiveRecall incorrectly returns PositivePrecision.

I noticed this when testing an early stopping pipeline and found that the logged best trial metric did not align with the final model results. This is a self-evident fix (akin to a small typo), so I did not open a new issue for it.

• There's a descriptive title that will make sense to other developers some time from now.
• There's associated issues. All PR's should have issue(s) associated - unless a trivial self-evident change such as fixing a typo. You can use the format Fixes #nnnn in your description to cause GitHub to automatically close the issue(s) when your PR is merged.
• Your change description explains what the change does, why you chose your approach, and anything else that reviewers should know.
• You have included any necessary tests in the same PR.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 69.08%. Comparing base (fb39755) to head (93f5392).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
...osoft.ML.AutoML/AutoMLExperiment/IMetricManager.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7493      +/-   ##
==========================================
+ Coverage   69.01%   69.08%   +0.07%     
==========================================
  Files        1482     1482              
  Lines      273999   274619     +620     
  Branches    28258    28459     +201     
==========================================
+ Hits       189093   189726     +633     
+ Misses      77520    77512       -8     
+ Partials     7386     7381       -5     

Flag	Coverage Δ
Debug	69.08% <0.00%> (+0.07%)	⬆️
production	63.38% <0.00%> (+0.07%)	⬆️
test	89.51% <ø> (+0.04%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...osoft.ML.AutoML/AutoMLExperiment/IMetricManager.cs	51.76% <0.00%> (ø)

... and 16 files with indirect coverage changes

🚀 New features to boost your workflow:

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

[ericstj]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[LittleLittleCloud]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).