pathbar: Change cursor to text when action is loation entry

As part of commit f65c2921 ("window: Open location entry when current path is clicked") we allow entering location entry by clicking the current folder button. This, however, is not at all obvious, not only defeats the original intent of the change but also leads to issues such as the inability to maximize the nautilus window (by double clicking the current folder). Hopefully if we make the action more obvious, errors will be less likely.

Furthermore, with the pending elimination of Other Places (and replacement by Network View), Computers would be the lone remaining item in the sidebar. Since there is a desire to drop Computer from the sidebar, we need to make it clear for users that want access to the root file system of how to get there