Revert "DEV: Draft check async when starting new PM"

This reverts commit e49212d0bc.

This requires some more work.

app/assets/javascripts/discourse/app/routes/application.js

@@ -85,7 +85,6 @@ const ApplicationRoute = DiscourseRoute.extend(OpenComposer, {
         recipients,
         archetypeId: "private_message",
         draftKey: Composer.NEW_PRIVATE_MESSAGE_KEY,
-        draftSequence: 0,
         reply,
         title
       });