Remove unused variable

Author: BrendanC23

lib/java-caller.js

@@ -160,7 +160,7 @@ class JavaCaller {
             });
 
             // Catch status code
-            child.on("close", (code, signal) => {
+            child.on("close", (code) => {
                 if (timeoutId) {
                     clearTimeout(timeoutId);
                 }