Fixes #11184
Fixes #11581

Before clicking "Create"

• Branch is derived from the latest master
• Add the pins or archive_alpha_games 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

In def actions(entity), I had these two lines in the reverse order:

return ['sell_shares'] if entity == current_entity&.owner && can_ebuy_sell_shares?(current_entity)
return [] if entity != current_entity

which caused the error.

I also added a couple of small improvements to the code, fixing how the share sales were treated depending on if it was a sale or issuing.