Fix #12497: Add workaround for motion_counter being implemented correctly.
#12229 stopped updating motion_counter for non-engine parts of trains, and in doing so accidentally followed the spec for NewGRF var 46, which breaks NewGRFs that used to... accidentally work. Make var 46 return motion_counter of the first engine, regardless of self or parent scope. This means var 46 is always in sync with the head engine, and avoids further changes to when motion_counter is updated. (cherry picked from commit 9539b02455f672e11f3ac32302a00cffa5507770)pull/688/head
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6056a00222
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