Bug 23339: Reindent addbooks.tt

Bug 23339: Reindent addbooks.tt

This patch reindents cataloguing/addbooks.tt to use four spaces,
following coding guidelines.

To test, apply the patch and use your preferred method for checking the
differences between files while ignoring whitespace. I use diff with the
"-w" flag, but you should look into your own heart for the
right solution.

Go to Cataloging. Test that the initial page and search results view
look correct and work correctly.

Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>