Fix `TypeError: no implicit conversion of Symbol into Integer` on characters#show and campaign wallet balances

Fix TypeError: no implicit conversion of Symbol into Integer on characters#show and campaign wallet balances. amount.to_s(:delimited) isn’t valid Ruby (Integer#to_s takes a base, not a formatting symbol) – both app/views/characters/show.html.erb (Inventory tab wallet summary) and app/views/campaign_wallets/_wallet_balances.html.erb had the typo. Latent since the wallet feature shipped because no character had a funded wallet yet; surfaced the moment Session 38’s D&D Beyond currency sync gave every character a real balance. Fix: number_with_delimiter(amount). Honeybadger #132162996.