Set owner type on workshop log to workshop (#537)

* Remove validation on workshop from story idea (bc sometimes enter external workshop title)

* Set owner_type to Workshop if workshop_id present on workshop_log

Author: maebeale

app/models/story_idea.rb

@@ -23,7 +23,6 @@ class StoryIdea < ApplicationRecord
   validates :updated_by_id, presence: true
   validates :project_id, presence: true
   validates :windows_type_id, presence: true
-  validates :workshop_id, presence: true
   validates :body, presence: true
   validates :permission_given, presence: true
   validates :publish_preferences, presence: true

app/models/workshop_log.rb

@@ -168,6 +168,7 @@ def update_owner_and_date
     changes = {}
     changes[:date] = created_at if date.blank?
     changes[:owner_id] = workshop_id if owner_id.blank?
+    changes[:owner_type] = "Workshop" if workshop_id
     update_columns(changes) if changes.any?
   end