Make aggregate entries work when the review panel is minimised.

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

@@ -210,6 +210,7 @@
 .rp-entry-wrapper {
 	&:hover .rp-entry-insert,
 	&:hover .rp-entry-delete,
+	&:hover .rp-entry-aggregate,
 	&:hover .rp-entry-comment {
 		display: block;
 	}