Fix test failure

* test was attempting to parse ints when the interval
 can be a double

src/tests/tracing/eventcounter/regression-25709.cs

@@ -19,7 +19,7 @@ public class SimpleEventListener : EventListener
     {        
         private readonly EventLevel _level = EventLevel.Verbose;
 
-        public int MaxIncrement { get; private set; } = 0;
+        public double MaxIncrement { get; private set; } = 0;
 
         public SimpleEventListener()
         {
@@ -38,7 +38,7 @@ protected override void OnEventSourceCreated(EventSource source)
 
         protected override void OnEventWritten(EventWrittenEventArgs eventData)
         {
-            int increment = 0;
+            double increment = 0;
             bool isExceptionCounter = false;
 
             for (int i = 0; i < eventData.Payload.Count; i++)
@@ -52,7 +52,7 @@ protected override void OnEventWritten(EventWrittenEventArgs eventData)
                             isExceptionCounter = true;
                         if (payload.Key.Equals("Increment"))
                         {
-                            increment = Int32.Parse(payload.Value.ToString());
+                            increment = double.Parse(payload.Value.ToString());
                         }
                     }
                     if (isExceptionCounter)