Fix PositiveRecall optimization in AutoMLExperiment (#7493)

Author: JoshuaSloan

src/Microsoft.ML.AutoML/AutoMLExperiment/IMetricManager.cs

@@ -63,7 +63,7 @@ public double Evaluate(MLContext context, IDataView eval)
                 BinaryClassificationMetric.PositivePrecision => metric.PositivePrecision,
                 BinaryClassificationMetric.NegativePrecision => metric.NegativePrecision,
                 BinaryClassificationMetric.NegativeRecall => metric.NegativeRecall,
-                BinaryClassificationMetric.PositiveRecall => metric.PositivePrecision,
+                BinaryClassificationMetric.PositiveRecall => metric.PositiveRecall,
                 BinaryClassificationMetric.F1Score => metric.F1Score,
                 _ => throw new NotImplementedException(),
             };