Fixed an inconsistency in the default ID of GroupInviterData, where G…

…roupService claims it should be -1 but it's 0 when server initializes

src/main/java/com/projectswg/holocore/resources/support/objects/swg/creature/CreatureObjectSharedNP.java

@@ -47,7 +47,7 @@ class CreatureObjectSharedNP implements MongoPersistable {
 
 	private final CreatureObject obj;
 
-	private transient GroupInviterData inviterData	= new GroupInviterData(0, null, 0);
+	private transient GroupInviterData inviterData	= new GroupInviterData(-1, null, 0);
 	private transient long groupId			= 0;
 
 	private short	level					= 1;