Bug 21034: Re-indent circulation.tt

Bug 21034: Re-indent circulation.tt

This patch reindents the template for the checkout page, circulation.tt:

- Trailing spaces removed
- Indentation changed to a consistent 4 spaces
- Markup indentation made more consistent

To test, view the checkout page under various circumstances:

- No card number submitted
- Name submitted (patron search results)
- Card number submitted
  - Restricted patron
  - Patron with circulation messages
  - On-site checkouts
  - Check all tabs: checkouts, relatives' checkouts holds, article
    requests, restrictions, clubs

HTML validation before and after the patch should return the same
results.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>