Tweak padding around track changes toggle loading indicator

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

@@ -129,6 +129,9 @@
 			cursor: auto;
 			margin-right: 5px;
 		}
+	.review-panel-toolbar-spinner {
+		margin-left: 5px;
+	}
 
 .rp-entry-list {
 	.rp-size-expanded & {