Correct variable in span event

Signed-off-by: Viet Nguyen Duc <[email protected]>

Author: VietND96

java/src/org/openqa/selenium/grid/node/local/LocalNode.java

@@ -1068,7 +1068,7 @@ public void drain() {
       } else {
         pendingSessions.set(currentSessionCount);
         span.addEvent(
-            String.format("%s session(s) pending before draining Node", currentSessionCount));
+            String.format("%s session(s) pending before draining Node", attributeMap));
       }
     }
   }