[1822] fixes SELL_AFTER rule

[philcampeau]

Fixes #5764

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• Branch is derived from the latest master
• Add the pins label if this change will break existing games
• Code passes linter with docker compose exec rack rubocop -a
• Tests pass cleanly with docker compose exec rack rake

Implementation Notes

• Explanation of Change

Currently, the game code allowed a player with a corp in EMR to sell shares of the acting company, even if it were that corp's first OR. However, rule 4.4.1 states "• Shares cannot be sold in a company that has not completed an operating round."

I added a new option for the SELL_AFTER constant, :full_or_turn, that doesn't allow the sale of any shares of a corp until that corp has completed an OR.

The way I did this was to have it first check if we're in an operating round, and if the current entity is the president of the corporation whose shares are being sold. If so, the corporation needs an operating history size greater than 1. Else, corporation.operated? simply needs to be true.

Logically, this should work, but please let me know if I've missed something. If this is correct, there are a few other games which could use this code as well.

Also deleted a fixture file that no longer worked as a result of this change.