2.5.0.1 - Redesigning an engine does not recompute engine type skill effects

[thexa4]

Steps to reproduce:

1. Go to R&D
   
2. Click Modify design of engine `1935 Electric`
   
3. Click redesign
   
4. Note that Engine Length and Width are 914mm x 838mm.
   
5. Click on Layout
   
6. Under Engine Layout, reselect Electric
   
7. Note that Engine Length and Width are now 711mm x 685mm
   

Before:
   

After: