Fixed Missing Prefix At Dbtechgallerypro Importer

I got a minor bug while importing DBTechGalleryPro From vBulletin
Thought it is better to report
at method stepAlbums

Code:

SELECT cat.*, image.catid
                    FROM ' . $prefix . 'dbtech_gallery_categories AS cat
                    LEFT JOIN dbtech_gallery_images AS image
                    ON (cat.catid = image.catid)
                    WHERE image.catid > 0 and image.albumid = 0
                    GROUP BY image.catid

table dbtech_gallery_images missing the prefix causing MySQL error