Bug 31893: Use checkauth and do not fetch about.tt template

Bug 31893: Use checkauth and do not fetch about.tt template

This patch updates four scripts to use checkauth instead of get_template_and_user

reserve/modrequest.pl
reserve/modrequest_suspendall.pl
course_reserves/mod_course.pl
members/members-update-do.pl

No behvaiour change is expected

To test:
0 - Apply patch
1 - Place some holds for a patron
2 - From patron page, confirm you can suspend all
3 - confirm you can delete marked holds
4 - Edit a course in course-reserves
5 - Make a chaneg to personal details via OPAC
6 - Confirm change can be approved on staff side

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>