reordered block statements

roles/mastodon/tasks/system_setup/mastodon.yml

@@ -1,7 +1,4 @@
 - block:
-  become: true
-  become_user: "{{ mastodon_user }}"
-
   - name: Clone mastodon
     git:
       repo: "https://github.com/mastodon/mastodon.git"
@@ -49,6 +46,9 @@
       chdir: "{{ mastodon_home }}/{{ mastodon_path }}"
     when: production_config.stat.exists
 
+  become: true
+  become_user: "{{ mastodon_user }}"
+
 - name: Install systemd sidekiq Service Files
   template:
     src: mastodon-sidekiq.service.j2