front: imported train pathfinding is not recomputed when its rolling stock is changed

[clarani]

What happened?

I import trains from a xml file. After importing it, I modified the rollingStock of one of them (which was invalid because its rolling stock was unknown).
After that, when I navigated to the itinerary tab, the pathfinding was not relaunch even though the rolling stock and the pathSteps were defined

What did you expect to happen?

The pathfinding should be launched

How can we reproduce it (as minimally and precisely as possible)?

1. Import the xml (ask me by dm)
2. Edit the rolling stock of the first train
3. Click on itinerary tab

On which environments the bug occurs?

Recette (SNCF), Local

On which browser the bug occurs?

Firefox

OSRD version (top right corner Account button > Informations)

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