German OOB 16: minor corrections

[Pibwl]

As a side note to Polish OOB, I think, that unit 859 Schlepper C7(p) is redundant - there are known some photos with German markings, but its use was rather insignificant, and probably limited to auxiliary duties in occupied countries. I haven't heard about any artillery units re-equipped with C7P, and the Germans had a lot of standard halftracks. More popular were captured Soviet tractors, like Stalinez-65 (German designation), apparently used also by some artillery units (although I don't suggest to add one). If it's not removed, it should have radio 3. If we'd like to keep artillery tractor in this place, a German sWS could be added.

BTW: why 648 SdKfz 11 has radio 3? It was a standard tractor for light artillery, although less popular, than SdKfz 7.