[syncthing] Fix bad syncthing group

ansible/roles/syncthing/tasks/main.yml

@@ -5,6 +5,9 @@
 - name: Syncthing enabled
   shell: sysrc syncthing_enable="YES"
 
+- name: Syncthing group set to wheel
+  shell: sysrc syncthing_group="wheel"
+
 - name: Ensure syncthing is running
   service: name=syncthing state=started