🐛 Fixed email only to post rescheduling. (#17538)

refs https://github.com/TryGhost/Product/issues/3657

- When reverting a post to a draft, the meta, `email_only` remained
true.
- This fix switches `email_only` back to false when the `revertToDraftTask` is executed.

ghost/admin/app/utils/publish-options.js

@@ -340,6 +340,7 @@ export default class PublishOptions {
             }
 
             this.post.status = 'draft';
+            this.post.emailOnly = false;
 
             return yield this.post.save();
         } catch (e) {