Simplify determination of SockJS path

The SockJS path is now passed to the SockJsService handleRequest method
thus removing the need to guess it.

Issue: SPR-11058

spring-messaging/src/main/java/org/springframework/messaging/simp/config/AbstractStompEndpointRegistration.java

@@ -147,7 +147,7 @@ public abstract class AbstractStompEndpointRegistration<M> implements StompEndpo
 		}
 
 		protected SockJsService getSockJsService() {
-			return super.getSockJsService(paths);
+			return super.getSockJsService();
 		}
 	}