Include surface_index in on_pre_build

[Zelaron]

When a player places a blueprint, the 'on_pre_build' event contains no surface information.

We get the player_index (but player surface can differ from the blueprints) and the map position, which is not enough if we don't know the surface.

[Rseding91]

The player surface won't differ from the built blueprint. The player surface is directly used to build the blueprint.

[Zelaron]

Thanks for the reply. I should have tried that. I just assumed it would use the surface the player character was on.