This patch improves how the Petra AI uses the Elephant class:
- For soldiers, remove the Champion requirement, in case mods have non-Champion elephants.
- For mobile dropsites, replace Elephant with Unit, in case a mod adds e.g. an ox-cart or something (Xiongnu?).
- Since D2511/rP23579, worker elephants can no longer build, but the AI assumes they can, and erroneously labels them as workers, therefore remove now obsolete lines.