setup: same vertical height on the "Register with server" page
setup: same vertical height on the "Register with server" page

Without this, the "Create new keyfile" sub-page is smaller than
the "Use existing keyfile" sub-page, so changing between them
makes whole vertically centered page jump around.

shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,Tarsnap/tarsnap-gui,shinnok/tarsnap-gui,shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,shinnok/tarsnap-gui,Tarsnap/tarsnap-gui,shinnok/tarsnap-gui