[1832] update to P4 code

[philcampeau]

Before clicking "Create"

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

Implementation Notes

Explanation of Change

Configured which shares can be received in exchange for P4 - London Investment

Screenshots

Any Assumptions / Hacks