[imp] access to IMP w/o a horde generated login screen

[Liam Hoekenga]

> This is what the code is supposed to do; sounds more like a caching issue
> than anything.

I'm not sure how it could be cached.  We don't use the horde login page, so it
is never displayed.

> I don't think it will, but does this make any difference?
> 
>
https://marina.horde.org/horde/util/go.php?url=http%3A%2F%2Fcvs.horde.org%2Fdiff.php%2Fimp%2Flogin.php%3Fr1%3D2.186%26r2%3D2.187%26ty%3Du

Actually, this did fix it.

Liam