Bug 14898: Add button at manual invoice to redirect to pay tab
Test plan:
1. Create manual invoice for any patron and click on "Save", you should
be redirected to Account tab
2. Create manual invoice for any patron and click on "Save and pay", you
should be redirected to Account tab
Signed-off-by: David Nind <david@davidnind.com> Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de> Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>