Fix matrix_ma1sd_service_stat.stat.exists sometimes being undefined

roles/matrix-ma1sd/tasks/migrate_mxisd.yml

@@ -18,14 +18,13 @@
   stat:
     path: "{{ matrix_systemd_path }}/matrix-mxisd.service"
   register: matrix_mxisd_service_stat
-  when: "ma1sd_migrate_mxisd_data_dir_stat.stat.exists"
 
 - name: Ensure matrix-mxisd is stopped
   service:
     name: matrix-mxisd
     state: stopped
     daemon_reload: yes
-  when: "ma1sd_migrate_mxisd_data_dir_stat.stat.exists and matrix_mxisd_service_stat.stat.exists"
+  when: "matrix_mxisd_service_stat.stat.exists"
 
 - name: Check existence of matrix-ma1sd service
   stat:
@@ -63,11 +62,11 @@
   file:
     path: "{{ matrix_systemd_path }}/matrix-mxisd.service"
     state: absent
-  when: "matrix_ma1sd_service_stat.stat.exists"
+  when: "matrix_mxisd_service_stat.stat.exists"
 
 - name: Ensure systemd reloaded after removing outdated matrix-mxisd.service
   service:
     daemon_reload: yes
-  when: "matrix_ma1sd_service_stat.stat.exists"
+  when: "matrix_mxisd_service_stat.stat.exists"