'GLO' picked over 'World' market by downstream modules

[alvarojhahn]

Problem

The metals module creates market for X at World. When later modules (e.g., final energy) rebuild the index, the fallback in handle_default_option (transformation.py) tries ["RoW", "GLO", "World"], and GLO is selected over World.

I do not know if this is relevant for other modules other than metals.

Proposed fix

Reorder to ["World", "RoW", "GLO"]