implemented highlighting of tiles on action edit

src/main/java/de/srsoftware/web4rail/actions/WaitForContact.java

@@ -57,6 +57,12 @@ public class WaitForContact extends ActionList {
 		return true;
 	}
 	
+	@Override
+	protected String highlightId() {
+		return isSet(contact) ? contact.id().toString() : null;
+	}
+	
+	
 	@Override
 	public JSONObject json() {
 		JSONObject json = super.json();