Fix Matrix homeserver name in Dimension configuration

roles/matrix-dimension/defaults/main.yml

@@ -38,7 +38,7 @@ matrix_dimension_configuration_yaml: |
   homeserver:
     # The domain name of the homeserver. This is used in many places, such as with go-neb
     # setups, to identify the homeserver.
-    name: "{{ matrix_server_fqn_matrix }}"
+    name: "{{ matrix_domain }}"
 
     # The URL that Dimension, go-neb, and other services provisioned by Dimension should
     # use to access the homeserver with.