style(deps): rename default note to self config variable

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

@@ -167,4 +167,4 @@ matrix_mautrix_signal_bridge_personal_filtering_spaces: true
 # Setting this to false fixed the issue.
 matrix_mautrix_signal_bridge_restricted_rooms: true
 
-matrix_mautrix_signal_default_note_to_self_avatar_uri: "mxc://maunium.net/REBIVrqjZwmaWpssCZpBlmlL"
+matrix_mautrix_signal_bridge_note_to_self_avatar: "mxc://maunium.net/REBIVrqjZwmaWpssCZpBlmlL"

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

@@ -112,7 +112,7 @@ bridge:
     # Should the Signal user's phone number be included in the room topic in private chat portal rooms?
     number_in_topic: true
     # Avatar image for the Note to Self room.
-    note_to_self_avatar: {{ matrix_mautrix_signal_default_note_to_self_avatar_uri }}
+    note_to_self_avatar: {{ matrix_mautrix_signal_bridge_note_to_self_avatar }}
 
     portal_message_buffer: 128