Revisions: Update the compare mode before rendering subviews.

See #24425.

git-svn-id: http://core.svn.wordpress.org/trunk@24627 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/revisions.js

@@ -366,6 +366,7 @@ window.wp = window.wp || {};
 				wp.Backbone.View.prototype.render.apply( this, arguments );
 
 				$('#wpbody-content .wrap').append( this.el );
+				this.updateCompareTwoMode();
 				this.views.ready();
 			}, this ) );