`digistuff:channelcopier` fails to copy channel name for spacecannons

[dennisjenkins75]

digistuff:channelcopier fails to copy channel name for spacecannons.

[SwissalpS]

thanks, there are three ways of solving this.

1. (unlikely to be merged) adding spacecannons to the channel-copier
2. adding the _digistuff_channelcopier_fieldname field to the space-cannon's definition
3. adding a mod that sets it like we did on pandorabox (space cannon doesn't seem to be added there yet either)

related: pandorabox-io/pandorabox.io#550