front: drop pathfinding error message bubble

The "pathfindingError" translation needs an "errorMessage" property,
so it's not displayed properly.

Since the error is already displayed to the user in a different way,
we can just drop the bubble.

To reproduce:

- Select a train in small_infra
- Switch to another infra (e.g. France)
- Open the "Create new train" modal

Signed-off-by: Simon Ser <contact@emersion.fr>

Author: emersion

front/src/modules/pathfinding/hooks/usePathfinding.ts

@@ -87,7 +87,6 @@ const usePathfinding = (
       launchPathfinding(updatedPathSteps);
     } else {
       setError(t('missingPathSteps'));
-      dispatch(setFailure({ name: t('pathfindingError'), message: t('missingPathSteps') }));
     }
   };