fix: fix create warp/sign in non-island world

Currently, you can't create a warp in another world (even with permissions) as it goes into hasCorrectIslandRank. In this case, it is always false as there is no island at the block location meaning it will always go into this whilst creating a warp in other worlds.

src/main/java/world/bentobox/warps/listeners/WarpSignsListener.java

@@ -163,7 +163,7 @@ public class WarpSignsListener implements Listener {
                 return;
             }
 
-            if(!hasCorrectIslandRank(b, user)) {
+            if (inWorld && !hasCorrectIslandRank(b, user)) {
                 e.setLine(0, ChatColor.RED + addon.getSettings().getWelcomeLine());
                 user.sendMessage("warps.error.not-correct-rank");
                 return;