ata_id: unbotch format specifier

Commit v218-247-g11c6f69 broke the output of the utility. "%1$" PRIu64
"x" expands to "%1$lux", essentially "%lux", which shows the problem.
u and x cannot be combined, u wins as the type character, and x gets
emitted verbatim to stdout.

References: https://bugzilla.redhat.com/show_bug.cgi?id=1227503
(cherry picked from commit ec62e858)