Update e2fsprogs suite to v1.45.0.

Sorry that this happens so short before the 2019Q2 branch; the
e2fsprogs.sourceforge.net website hadn't been updated for 1.44.6 and 1.45.0.

I am not packaging e2scrub[_all] as FreeBSD does not support LVM,
Linux's logical volume manager.

Changelogs:
https://raw.githubusercontent.com/tytso/e2fsprogs/master/doc/RelNotes/v1.44.6.txt
https://raw.githubusercontent.com/tytso/e2fsprogs/master/doc/RelNotes/v1.45.0.txt

While here, reset misc/e2fsprogs-libuuid PORTREVISION back to 0 now that
the included PORTVERSION got bumped.