Build fixies

[kevingranade]

Summary

None

Purpose of change

The merge of #78357 broke the build, not quite sure how, but pretty sure a merge queue would have prevented it.
I'm trying to turn clang-tidy (src) on and warnings keep sneaking in.

Describe the solution

Remove a conflicting set_pos(tripoint) method that seems to be dead code anyway and replace with set_pos( tripoint_bub_ms ).
Un-auto some variables, do a UTF8 path translation on a raw string, remove an unneeded tuple constructor from the arguments to an emplace invocation.

Describe alternatives you've considered

LEaVe it bRokEn?

Testing

It builds, it runs, the infernal racket of the tooling overlords is silenced.

[Maleclypse]

../tests/vehicle_fake_part_test.cpp:363: FAILED:
(~[slow] ~[.],starting_items)=>   CHECK( !you.sees( you.pos_bub() + point( 10, 10 ) ) )
(~[slow] ~[.],starting_items)=> with expansion:
Error: (~[slow] ~[.],starting_items)=>   false

Looks like it's still failing for reasons.

[kevingranade]

Pre-existing failure I think, unfortunately I haven't been able to reproduce it locally.