Bug 10433 - colspan calculation done by opac/opac-reserve.pl should be moved to template

Since the bootstrap OPAC's place hold interface doesn't use tables
there is no use for the colspan calculation being done in the script.
This patch removes it.

To test, place one or more holds in the OPAC and confirm that there are
no display problems. The OPAC error logs should show no associated
error.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
No display problems, no related errors on log, no koha-qa errors

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes tests and QA script, no regressions found.

Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>