[Toybox] [PATCH] test -ot -nt: Use mtime instead of atime, nanosecond fix, tests

[Oliver Webb]

Does what is says on the tin.

-   Oliver Webb <aquahobbyist at proton.me>

P.S. Busybox test doesn't seem to care about sub-second precision in -ot/-nt:
https://git.busybox.net/busybox/tree/coreutils/test.c#n630 
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