Correction after PR #9652

1. Use post-update version for check of version number in extensions
table - it seems on update the version is updated in the extensions
table before the schema update sql scripts are executed.
2. Add forgotten name quoting for column "converted"

administrator/components/com_admin/sql/updates/mysql/3.5.1-2016-03-29.sql

@@ -3,4 +3,4 @@
 -- to force a new conversion when updating from version 3.5.0
 --
 
-UPDATE `#__utf8_conversion` SET converted = 0 WHERE (SELECT COUNT(*) FROM `#__extensions` WHERE `extension_id`=700 AND `manifest_cache` LIKE '%"version":"3.5.0"%') = 1;
+UPDATE `#__utf8_conversion` SET `converted` = 0 WHERE (SELECT COUNT(*) FROM `#__extensions` WHERE `extension_id`=700 AND `manifest_cache` LIKE '%"version":"3.5.1%') = 1;