Fix theme preview URL for themes loaded via AJAX on Install Themes screen.

props ocean90.
fixes #27128.

git-svn-id: https://develop.svn.wordpress.org/trunk@27247 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-theme-install-list-table.php

@@ -192,7 +192,7 @@ class WP_Theme_Install_List_Table extends WP_Themes_List_Table {
 		$preview_url   = add_query_arg( array(
 			'tab'   => 'theme-information',
 			'theme' => $theme->slug,
-		) );
+		), self_admin_url( 'theme-install.php' ) );
 
 		$actions = array();