Train previews bugged in depot window

[EsquimaltNanaimo]

Describe the bug
When a train is in a depot, flipped units have backwards previews.

Foreground (train setup) window shows the larger locomotive in its correct orientation. Depot window (behind) shows it backwards.

Steps to reproduce
Flip a locomotive in the depot.

Build version
0.56

Platform
Windows 7 x64

Reproducibility
Every time.

[andrewpey]

Fixed in 0.58