AutoConfigBackup current host appears twice in dropdown

When building the lists of available host names on the Restore tab, the current host is listed twice if it already has some backups.
This makes the code a bit smarter to not do that.
IMHO not worth updating the version number, since this is purely cosmetic.
AutoConfigBackup version bump
AutoConfigBackup version bump
AutoConfigBackup version bump
AutoConfigBackup version bump

That is a bit of a pain how some packages also have their version in a package-specific XML and it gets out of date.
I do not think it is really used for anything.
Merge pull request #735 from phil-davis/patch-2