Use elevation of source hex when checking for leaving prohibited terrain #6137
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The MoveStep check that ensures an Entity leaving a prohibited hex only leaves by a road uses the coordinates of the source hex but the elevation of the destination hex. When a mek moves from deeper water into a depth 1 hex, Mek::isLocationProhibited treats it like a mek using UMU (since it is above the hex floor) breaking the surface of the water.
Fixes #6124