restConfiguration - jetty - endpointProperty

I found a bug.

[source code]
https://github.com/apache/camel/blob/camel-2.14.x/components/camel-jetty/src/main/java/org/apache/camel/component/jetty/JettyHttpComponent.java#L996

[bug]

String url = "jetty:%s://%s:%s/%s?httpMethodRestrict=%s";
if (!query.isEmpty()) {
url = url + "?" + query;

[correction]

String url = "jetty:%s://%s:%s/%s?httpMethodRestrict=%s";
if (!query.isEmpty()) {
url = url + "" + query;