Update plugin/controller/src/main/java/org/carlmontrobotics/deepblues…

…im/WebotsSupervisor.java

Co-authored-by: CoolSpy3 <55305038+CoolSpy3@users.noreply.github.com>

plugin/controller/src/main/java/org/carlmontrobotics/deepbluesim/WebotsSupervisor.java

@@ -359,7 +359,7 @@ private static int stepSimulation(Supervisor robot, int basicTimeStep) {
         return robot.step(basicTimeStep);
     }
 
-    private static String lastMsg = new String();
+    private static String lastMsg = "";
     private static long lastMsgTimeMillis = 0,
             minTimeBetweenRepeatsMillis = 10000;