Fix Gmessages regression (missing homeserver.address and homeserver.domain configuration)

f9705b3323 reworked the configuration and missed wiring
these to the existing variables.

roles/custom/matrix-bridge-mautrix-gmessages/templates/config.yaml.j2

@@ -150,9 +150,9 @@ homeserver:
     # The address that this appservice can use to connect to the homeserver.
     # Local addresses without HTTPS are generally recommended when the bridge is running on the same machine,
     # but https also works if they run on different machines.
-    address: http://example.localhost:8008
+    address: {{ matrix_mautrix_gmessages_homeserver_address | to_json }}
     # The domain of the homeserver (also known as server_name, used for MXIDs, etc).
-    domain: example.com
+    domain: {{ matrix_mautrix_gmessages_homeserver_domain | to_json }}
 
     # What software is the homeserver running?
     # Standard Matrix homeservers like Synapse, Dendrite and Conduit should just use "standard" here.