Fix error in query builder

Fixes #13274

Signed-off-by: Michal Čihař <michal@cihar.com>

ChangeLog

@@ -24,6 +24,7 @@ phpMyAdmin - ChangeLog
 - issue #13258 Fixed detection of Amazon RDS
 - issue #13241 Redirect user to last page that has any tables to display
 - issue #13266 Fix link to User accounts overview page
+- issue #13274 Fix error in query builder
 
 4.7.0 (2017-03-28)
 - patch #12233 [Display] Improve message when renaming database to same name

libraries/DbQbe.php

@@ -8,6 +8,7 @@
 namespace PMA\libraries;
 
 use PMA\libraries\URL;
+use PMA\libraries\Util;
 
 /**
  * Class to handle database QBE search
@@ -1561,7 +1562,7 @@ class DbQbe
         if (empty($from_clause)) {
             // Create cartesian product
             $from_clause = implode(
-                ", ", array_map('PMA\libraries\Util::backquote', $search_tables)
+                ", ", array_map('Util::backquote', $search_tables)
             );
         }