[core/18RoyalGorge] add `Dividend` to `ability_blocking_step`, fix debt/company interactions

[michaeljb]

• fixes debt pay-off and 13LB Gold Nugget bonus interacting and breaking
• possibly also affects Ghost Town Tour Co. (Y2), which is also active during the dividend step

No issue to link, issue was reported by the designer directly to me.

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• [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