Make sure that vested claims are not transferable (#1160)

* Make sure that vested claims are not transferable

We need to deposit the claimed balance to the destination account before
setting the locks through the vesting module. Otherwise we loose the
locks and the vested claim is directly transferable.

* Add comment

* Enable missing feature for webbrowser check

* Remove unneeded error variant

* Increment `spec_version`'s

* Fix tests