Remove creates property for drush init

Under Drush `9.x`, the initialization was failing in the case of
a pre-provisioned box which didn't yet have `drush.yml`.

That caused aliases to not work.

`drush init` is inherently idempotent.  It won't copy files that
already exist, and it won't add to `.bash_profile` if the additions
are already there.

tasks/main.yml

@@ -7,11 +7,13 @@
     path: "~/.bashrc"
     state: touch
 
+# `drush init` is inherently idempotent.  It won't copy files that
+# already exist, and it won't add to `.bash_profile` if the additions
+# are already there.
 - name: Run `drush init`.
   become: no
   command: drush init -y
   args:
-    creates: ~/.drush/drush.bashrc
     chdir: "{{ drupal_core_path }}"
 
 - block: