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

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

Test Plan:
1) Set a patron's privacy to "Never"
2) Check out a few items to a patron
3) Check in one item
4) Note the "Print checkin slip" diplays
3) Apply this patch
4) Check in an  item
5) Note the option is now missing
6) Set the patron's privacy to "Forever" or "Default"
7) Check in an item
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>