#1313 - Override Problem.withStatus in ExtendedProblem to preserve payload.

When you use the withStatus() method on an ExtendedProblem, it hands back a Problem, which drops the payload. This commit adds the same sort of override already provided for the other attributes in ExtendedProblem.

src/main/java/org/springframework/hateoas/mediatype/problem/Problem.java

@@ -195,6 +195,15 @@ public class Problem {
 			return new ExtendedProblem<>(getType(), title, getStatus(), getDetail(), getInstance(), extendedProperties);
 		}
 
+		/*
+		 * (non-Javadoc)
+		 * @see org.springframework.hateoas.mediatype.problem.Problem#withStatus(org.springframework.http.HttpStatus)
+		 */
+		@Override
+		public ExtendedProblem<T> withStatus(@Nullable HttpStatus status) {
+			return new ExtendedProblem<>(getType(), getTitle(), status, getDetail(), getInstance(), extendedProperties);
+		}
+
 		/*
 		 * (non-Javadoc)
 		 * @see org.springframework.hateoas.mediatype.problem.Problem#withDetail(java.lang.String)