Remove unneeded CSS animation.

services/web/app/views/project/editor/review-panel.pug

@@ -98,7 +98,7 @@
 				span.rp-overview-file-header-collapse(
 					ng-class="{ 'rp-overview-file-header-collapse-on': reviewPanel.overview.docsCollapsedState[doc.doc.id] }"
 				)
-					i.fa.fa-angle-down
+					i.fa.fa-angle-up
 
 			.rp-overview-file-entries(
 				review-panel-collapse-height="reviewPanel.overview.docsCollapsedState[doc.doc.id]"

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

@@ -584,7 +584,6 @@
 
 	.rp-overview-file-entries {
 		overflow: hidden;
-		transition: height .15s;
 	}
 
 .rp-comment-wrapper {