Fixed #bulkDestroy from calling bulkDestroy

Rather than calling itself with the newly created transaction, it would call
the "parent" method, which meant that two events were dispatched. TBH I think
we can get rid of the check for a transaction here, and so the parent method
too, but not 100% sure.

ghost/posts-service/lib/PostsService.js

@@ -366,7 +366,7 @@ class PostsService {
     async #bulkDestroy(options) {
         if (!options.transacting) {
             return await this.models.Post.transaction(async (transacting) => {
-                return await this.bulkDestroy({
+                return await this.#bulkDestroy({
                     ...options,
                     transacting
                 });