fix: Trigger campaigns only during business hours (#3085)

Fixes #2433

app/views/api/v1/widget/campaigns/index.json.jbuilder

@@ -1,6 +1,7 @@
 json.array! @campaigns do |campaign|
   json.id campaign.display_id
   json.trigger_rules campaign.trigger_rules
+  json.trigger_only_during_business_hours campaign.trigger_only_during_business_hours
   json.message campaign.message
   json.sender campaign.sender&.slice(:name, :avatar_url)
 end