District: add SMA boundary near Barons Court to rescue graph

Hammersmith p4 → Barons Court is broken
TPDG.DZ → TF50378 / 50379 / 51301?

Barons Court p1 → Hammersmith p1 is broken (I guess it's an SMA)
TF50192 → TPAP
TF50197 → TPAP