stop repeating trashcan contents

[dynst]

Summary

Content "Remove duplicate trashcan bags"

Purpose of change

Duplicating the trash itemgroup made sense, but repeating the revamped SUS trashcan contents in the same trashcan less so.

Describe the solution

Remove all instances of "repeat" on trashcans in mapgen.

Describe alternatives you've considered

A more thorough overhaul to make locations with a less than 100% chance of spawning potentially spawn an empty trash bag instead of just nothing.

Changing all spawn chances to 100%.

Testing

Additional context