50ms is sometimes not enough when the client is busy synchronizing.
Wait up to 500ms for the client to answer before we give up and show an
empty menu title.
Ideally we should request the title before the watched directory list, but
the list is currently sent implicitly on connect.
The context menu will now show "Share with ownCloud" instead of "Share" as
it does on other platforms.
This also updates the submodule to point to matching binaries.
