Remove started sharing notifications where the contact doesn't exist

The same as #7009 but now all of them ;)

db/migrate/20160820181334_remove_started_sharing_notifications_without_contact.rb → db/migrate/20160822212739_remove_started_sharing_notifications_without_contact.rb

@@ -5,7 +5,8 @@ class RemoveStartedSharingNotificationsWithoutContact < ActiveRecord::Migration
   def up
     Notification.where(type: "Notifications::StartedSharing", target_type: "Person")
                 .joins("INNER JOIN people ON people.id = notifications.target_id")
-                .joins("LEFT OUTER JOIN contacts ON contacts.person_id = people.id")
+                .joins("LEFT OUTER JOIN contacts ON contacts.person_id = people.id " \
+                       "AND contacts.user_id = notifications.recipient_id")
                 .delete_all("contacts.id IS NULL")
   end
 end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160820181334) do
+ActiveRecord::Schema.define(version: 20160822212739) do
 
   create_table "account_deletions", force: :cascade do |t|
     t.string   "diaspora_handle", limit: 255