zdtm: fix integer literal type bug in maps03

maps03 should have caught the bug fixed by 288cf5174165 "restore: mutate
tgt_addr in map_private_vma", but didn't because integer literals
(defaulting to 32-bit ints) were shifted out of range.

Signed-off-by: Jamie Liu <jamieliu@google.com>
Acked-by: Andrew Vagin <avagin@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>