[dev] RTL patch for tree

[Chuck Hagenbuch]

Quoting Vahid Ghafarpour <vahid at ghafarpour.com>:

> tree menu has some problem in RTL direction
> this patch fix some of this errors
> images should added in horde/themes/graphics/tree/ directory and patch
> file is for horde/templates/javascript/tree.js

Tweaked a bit and committed - thanks!

-chuck

-- 
"But she goes not abroad in search of monsters to destroy." - John 
Quincy Adams