Remove ma1sd leftovers

roles/matrix-ldap-registration-proxy/vars/main.yml

@@ -1,5 +0,0 @@
----
-
-# Doing `|from_yaml` when the extension contains nothing yields an empty string ("").
-# We need to ensure it's a dictionary or `|combine` (when building `matrix_ma1sd_configuration`) will fail later.
-matrix_ma1sd_configuration_extension: "{{ matrix_ma1sd_configuration_extension_yaml | from_yaml if matrix_ma1sd_configuration_extension_yaml | from_yaml else {} }}"