comm/iridium/IridiumManager: Cleanup.

# Conflicts:
#	src/java/pt/lsts/neptus/comm/iridium/IridiumManager.java

src/java/pt/lsts/neptus/comm/iridium/IridiumManager.java

@@ -104,7 +104,7 @@ public IridiumMessenger getCurrentMessenger() {
     }
 
     private Runnable pollMessages = new Runnable() {
-        Date lastTime = new Date(System.currentTimeMillis() - 3600 * 1000);
+        Date lastTime = new Date(System.currentTimeMillis() - Duration.ofHours(1).toMillis());
         Date lastCall;
         boolean running = false;