Use correct variable. props wet. fixes #26139.

Built from https://develop.svn.wordpress.org/trunk@26303


git-svn-id: http://core.svn.wordpress.org/trunk@26208 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/theme.js

@@ -445,7 +445,7 @@ themes.view.Themes = wp.Backbone.View.extend({
 
 		// 'Add new theme' element shown at the end of the grid
 		if ( themes.data.settings.canInstall ) {
-			this.$el.append( '<div class="theme add-new-theme"><a href="' + themes.data.settings.install_uri + '"><div class="theme-screenshot"><span></span></div><h3 class="theme-name">' + l10n.addNew + '</h3></a></div>' );
+			this.$el.append( '<div class="theme add-new-theme"><a href="' + themes.data.settings.installURI + '"><div class="theme-screenshot"><span></span></div><h3 class="theme-name">' + l10n.addNew + '</h3></a></div>' );
 		}
 
 		this.parent.page++;