Change permission name back to "administer conditional fields"

It appears that during the D6->D7 migration, the permission created by this module was changed from "administer conditional fields" to "administer dependencies". The latter is far too abstract and doesn't really get the point across - what sort of "dependencies" are we talking about?

In my opinion, the original name for the permission was much more correct, so I propose changing it back.

Because there is no stable release for the D7 version, I did not include an update function for this change, however, I'll gladly do so if requested.