Use nested path variables instead of Servlet's

Remove the overriden pathVariable method from the nested request
wrapper,so that the merged attributes are used instead of the ones
provided by servlet.

Closes gh-26163

spring-webmvc/src/main/java/org/springframework/web/servlet/function/RequestPredicates.java

@@ -1040,11 +1040,6 @@ public abstract class RequestPredicates {
 			return this.request.multipartData();
 		}
 
-		@Override
-		public String pathVariable(String name) {
-			return this.request.pathVariable(name);
-		}
-
 		@Override
 		@SuppressWarnings("unchecked")
 		public Map<String, String> pathVariables() {