Fixes multitile adjacency

Created by: Exxion

Not a lot to explain. Fixes multitile Adjacent() checks, for either object being multitile. It would also work to check adjacency if both objects are multitile but that could get very slow very quickly so please don't

Fixes #7150 (closed)

Tested for neighbor being multitile, which is the one that I could imagine might fail. Not tested for target or both objects being multitile because I couldn't be assed to make a whole new object just to debug that and the code for target being multitile is so simple it pretty clearly works.