Remove unused database import from billing page

The database import from '@kit/supabase/database' was removed because it was not used within the billing page. Therefore, it is unnecessary to include it in the page.tsx. This makes the code cleaner and slightly more efficient.

apps/web/app/(dashboard)/home/[account]/billing/page.tsx

@@ -2,7 +2,6 @@ import {
   BillingPortalCard,
   CurrentPlanCard,
 } from '@kit/billing-gateway/components';
-import { Database } from '@kit/supabase/database';
 import { getSupabaseServerComponentClient } from '@kit/supabase/server-component-client';
 import { If } from '@kit/ui/if';
 import { PageBody, PageHeader } from '@kit/ui/page';