Bug 40719: Explicitly turn off RELATIVE for TemplateUtils

This change explicitly turns off RELATIVE in Koha/TemplateUtils.pm

Test plan (Koha/TemplateUtils.pm):
0. Apply the patch and koha-plack --restart kohadev
1. Go to http://localhost:8081/cgi-bin/koha/tools/letter.pl
2. Click "New notice" and choose "reports"
3. Add the following to the report:
[% IF ( x == 1 ) %]
One
[% ELSE %]
Two
[% END %]
4. Go to http://localhost:8081/cgi-bin/koha/reports/guided_reports.pl?phase=Use%20saved
5. Create a report like the following:
SELECT biblionumber FROM biblio;
6. Click "Run with template" and choose the Reports template you made
7. Note that the output shows "Two"
8. Edit your Reports notice and include the following:
[% INSERT ../etc/passwd %]
9. Re-run the report using "Run with template"
10. Note that the output shows the regular SQL results (ie template transform not successful)

Signed-off-by: David Cook <dcook@prosentient.com.au>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit b86095ffe7)
Signed-off-by: Jacob O'Mara <jacob.omara@openfifth.co.uk>

Koha/TemplateUtils.pm

@@ -60,6 +60,7 @@ sub process_tt {
             {
                 EVAL_PERL   => 0,
                 ABSOLUTE    => 0,
+                RELATIVE    => 0,
                 PLUGIN_BASE => 'Koha::Template::Plugin',
                 COMPILE_EXT => $use_template_cache ? '.ttc'                                    : '',
                 COMPILE_DIR => $use_template_cache ? C4::Context->config('template_cache_dir') : '',