SPIGOT-5972: PlayerPortalEvent.setTo() when returning through an End Portal Crashes Server

By: md_5 <git@md-5.net>

paper-server/nms-patches/EntityPlayer.patch

@@ -475,7 +475,7 @@
 +                exit.setZ(k);
 +                // this.setMot(Vec3D.a);
 +                exitVelocity = Vec3D.a;
-+            } else {
++            } else if (worldserver.getTypeKey() == DimensionManager.THE_NETHER || worldserver1.getTypeKey() == DimensionManager.THE_NETHER) {
 +                ShapeDetector.Shape portalShape = worldserver.getTravelAgent().findAndTeleport(this, exitPosition, f2, event.getSearchRadius(), true);
 +                if (portalShape == null && event.getCanCreatePortal()) {
 +                    if (worldserver.getTravelAgent().createPortal(this, exitPosition, event.getCreationRadius())) { // Only check for new portal if creation succeeded