Fix mxisd -> ma1sd file copying

When the playbook executes on a remote host (as it usually does),
we need to explicitly say `src` is a remote file and not relative
to the playbook.

roles/matrix-ma1sd/tasks/migrate_mxisd.yml

@@ -52,6 +52,7 @@
 - name: Copy mxisd data files to ma1sd folder
   copy:
     src: "{{ item }}"
+    remote_src: true
     dest: "{{ matrix_ma1sd_data_path }}/"
     mode: "preserve"
     owner: "{{ matrix_user_username }}"