Remove remnants of TileAntenna.h

In https://git.astron.nl/RD/EveryBeam/-/blob/master/LofarMetaDataUtil.cc#L100 a feature from TileAntenna.h is used. This seems to be a remnant from an old LOFARBeam version, since I am getting a compile error here.

Furthermore, getting the size() of a typedef is not accepted by the compiler, i.e. I get a compilation error on TileConfig::size(). So how about using the following piece of code @tol?

  TileConfig config;
  assert(aips_offset.ncolumn() == config.size());

(instead of

  assert(aips_offset.ncolumn() == TileAntenna::TileConfig::size());

  TileConfig config;

)

Also, can we remove the (commented) import // #include "TileAntenna.h" https://git.astron.nl/RD/EveryBeam/-/blob/master/LofarMetaDataUtil.cc#L28)