Remove Harold Baker from 9 Dec 1957

From EC:

According to Davis Palmquist, the correct lineup of the band on 9 December 1957 is:
```
High brass: Nance, Terry, Anderson, Marenguito
Low brass: Woodman, Jackson, Sanders
Reeds: Hamilton, Procope, Hodges, Gonsalves, Carney
Rhythm: Ellington, Woode, Woodyard
Vocal: Grissom
```

ellingtonia lists Harold Baker too, that should be removed.