Fix station numbering in findStation to match {1, 2, 3} convention
The access to stations through DeFT::findStation(FTChannelID const& id) needed stations numbered {0, 1, 2}, which was inconsistent with the convention used throughout the FT.
The access to stations through DeFT::findStation(FTChannelID const& id) needed stations numbered {0, 1, 2}, which was inconsistent with the convention used throughout the FT.