Fix Provisioner dispute metrics naming (#4374)
* update dispute metric names Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * update Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>
* update dispute metric names Signed-off-by: Andrei Sandu <andrei-mihail@parity.io> * update Signed-off-by: Andrei Sandu <andrei-mihail@parity.io>