revert unneeded changes

roles/matrix-awx/tasks/rename_variables.yml

@@ -1,13 +1,7 @@
 
-- name: Check if matrix_vars.yml file exists
-  stat:
-    path: "/var/lib/awx/projects/clients/{{ member_id }}/{{ subscription_id }}/matrix_vars.yml"
-  register: matrix_vars_file
-
 - name: Rename synapse presence variable
   delegate_to: 127.0.0.1
   replace:
     path: "/var/lib/awx/projects/clients/{{ member_id }}/{{ subscription_id }}/matrix_vars.yml"
     regexp: 'matrix_synapse_use_presence'
     replace: 'matrix_synapse_presence_enabled'
-  when: matrix_vars_file.stat.exists