Fix MySQL bug on installing Mahara, reported in the forums by Bruce Ellis.

http://mahara.org/interaction/forum/topic.php?id=131
(cherry picked from commit 4c2a22677c3ae886f0a0f76aea15a0a15eb02eb4)

htdocs/lib/adodb/drivers/adodb-mysql.inc.php

@@ -89,7 +89,7 @@ class ADODB_mysql extends ADOConnection {
         }
         
         // get index details
-        $rs = $this->Execute(sprintf('SHOW INDEX FROM %s',$table));
+        $rs = $this->Execute(sprintf('SHOW INDEX FROM "%s"',$table));
         
         // restore fetchmode
         if (isset($savem)) {