Bot won't use its best plate for a recipe, keeping the last used instead

[Farfi55]

Strategic AI assigns recipes to bots based on the estimated time it takes to complete the recipe, which is calculated using the 'best' plate owned by the bot (if it has any).

But the bot currently has no way to change its 'current' plate to the best one.

We could create a new state (or extend an existing one) to pick up a better owned plate if he has any.

[Farfi55]

Fixed by adding a second case to PickUp plate state, which is:

when there is a better plate for the current recipe
pick that one instead

This sets the Bot's plate to this new one.

It would be more elegant to handle this without having to pickup the plate (and usualy dropping it off immediately), but it works for now, and it could play nicely once the place plate gets expanded to place the plate in a more central location