refactor(blueprint): set layer to 1, to allow other keybinds priority

[salinecitrine]

This allows things like adding bind Alt+sc_c gridmenu_key 1 3 before blueprint binds, so that, when using grid menu, alt+build on a factory builds a unit instead of creating a blueprint.

See https://discord.com/channels/549281623154229250/1281544470923448430 for some context