Alternate fix for Bug 6522 - search result list broken

Alternate fix for Bug 6522 - search result list broken

- Adding back the colspan removed in a previous commit
- Correcting the scope of two template variables.

Before applying this patch, the search results page in the
staff client will have misaligned headers if AmazonCoverImages
is turned off. After applying this patch headers should
appear correctly with AmazonCoverImages on or off.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>