Converts multiple warning signs into proper structures instead of varedits

[Henri215]

What Does This PR Do

Converts varedited signs that already had respective structures.

Why It's Good For The Game

Theres no reason to have a varedit structure if the structure you want already exists.

Testing

• Did fly around looking for any broken warning signs, all good.

[PacifistDalek]

Excellent, now i’d love to make them constructable from plastic or something :3