Bug 12271: add Bootstrap templates to valid-templates.t tests

Bug 12271: add Bootstrap templates to valid-templates.t tests

valid-templates.t actually tests the templates and includes of only
the "prog" theme at opac and intranet.  It does not test the opac
templates and includes of bootstrap theme, nor ccsr.  This is critical
since this test is used for patch integrations in release maintenance.

This patch adds the test of bootstrap opac theme.
I did not manage to add the ccsr theme since it is not a real theme,
meaning it has no templates and not all includes.

Test by runnning perl xt/author/valid-templates.t and looking at the
logs.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Now there are 902 lines, bootstrap tested (1 error detected!)
No koha-qa errors

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 8bc2fb4df6e14a97c3aa7a62fbacc4bc7cf5772d)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>