Bug 35924: Hide the print checkins button on the patron screens for patron's who...

Bug 35924: Hide the print checkins button on the patron screens for patron's who always anonymize

If a patron anonymizes their checkins, the checkin slip cannot retrieve any info to print the checkin slip. We should not show the button in this scenario

Test Plan:
1) Set a patron's privacy to "Never"
2) Note the "Print checkin slip" option in the Print button on the
   patrons toolbar displays
3) Apply this patch
4) Reload the page
5) Note the option is now missing
6) Set the patron's privacy to "Forever" or "Default"
7) Reload the page
8) Note the print checkins option is back!

Signed-off-by: Andrew Fuerste Henry <andrewfh@dubcolib.org>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>