user: Use correct format strings to print accounts_user_get_uid()

The Uid property is defined in the D-Bus introspection XML to be a
64-bit unsigned integer, so we need to treat it as such when using
varargs. Otherwise, architectures that do not align arguments on the
stack at 64-bit boundaries can parse the stack incorrectly, resulting
in a crash.

For whatever obscure ABI reason, among Debian's supported architectures
this only showed up as a segmentation fault on 32-bit ARM (specifically
ARMv5 softfloat and ARMv7 hardfloat), and not on (for example) i386.

Resolves: https://gitlab.freedesktop.org/accountsservice/accountsservice/-/issues/109
Signed-off-by: Simon McVittie <smcv@debian.org>

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