Adding logging configuration and default to the rest of the mautrixes that don't have them

roles/matrix-bridge-mautrix-signal/defaults/main.yml

@@ -57,6 +57,9 @@ matrix_mautrix_signal_homeserver_token: ''
 
 matrix_mautrix_signal_appservice_bot_username: signalbot
 
+# Specifies the default log level for all bridge loggers.
+matrix_mautrix_signal_logging_level: WARNING
+
 # Whether or not created rooms should have federation enabled.
 # If false, created portal rooms will never be federated.
 matrix_mautrix_signal_federate_rooms: true