Fix z-index issue in the resolved comments dropdown.

services/web/public/stylesheets/app/editor/review-panel.less

@@ -941,6 +941,7 @@
 	justify-content: center;
 	border-radius: 3px;
 	box-shadow: 0 0 20px 10px rgba(0, 0, 0, .3);
+	z-index: 1;
 
 	&::before {
 		content: '';