Bug#865528: don't escape dash (\x2d) when logging

[積丹尼 Dan Jacobson]

It turns out just plain dash works fine.

$ echo systemctl status 
dev-disk-by\x2dpath-pci\x2d0000:00:1f.1\x2data\x2d1.device|sed s/x2/-/g|sh -x
+ systemctl status dev-disk-by-dpath-pci-d0000:00:1f.1-data-d1.device
● dev-disk-by-dpath-pci-d0000:00:1f.1-data-d1.device
   Loaded: loaded
   Active: inactive (dead)