Engineers with detectors shouldn't disable mines

I'm not really sure why this exists in its current form. The AoE engineers have once you get them the mine detector upgrade that disables mines is kind of silly. Mines are one of the ways to counter blogs, but if they have an upgraded engine in that blog, the mine is negated unless they can be pushed off. Also just annoying having a 30 munition investment negated simply because that particular unit exists in the vicinity of it is weird.