Fix BasicErrorController include parameter parsing

This commit fixes an error in BasicErrorController where the wrong
property was referenced for binding error inclusion.

See gh-21702

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/servlet/error/BasicErrorController.java

@@ -172,7 +172,7 @@ protected boolean isIncludeMessage(HttpServletRequest request, MediaType produce
 	 * @return if the errors attribute should be included
 	 */
 	protected boolean isIncludeBindingErrors(HttpServletRequest request, MediaType produces) {
-		switch (getErrorProperties().getIncludeMessage()) {
+		switch (getErrorProperties().getIncludeBindingErrors()) {
 		case ALWAYS:
 			return true;
 		case ON_PARAM: