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Fix territory borders not showing up on OSX when compiled with the lastest…

Description

Fix territory borders not showing up on OSX when compiled with the lastest xCode.

The bug came from inlining the copy constructor of Grid, which ended up reading from un-initialized variables.

Discussed with leper who had a similar fix for a test failure locally.

Fixes #4859

Differential Revision: https://code.wildfiregames.com/D1048