Bug 37194: Improve link from unconfigured ILL module

Bug 37194: Improve link from unconfigured ILL module

To test:
1) Enable the ILLModule syspref
2) Go to the ILL module
3) Observe the link that reads "Take a look at the about page" and points to http://localhost:8081/cgi-bin/koha/about.pl#sysinfo_panel
4) Apply patch
5) Observe the link that reads "Take a look at the about page" now points to http://localhost:8081/cgi-bin/koha/about.pl?tab=sysinfo

Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>