set localpart of hookshot bot in main.yml

roles/custom/matrix-bridge-hookshot/defaults/main.yml

@@ -4,7 +4,7 @@
 # Project source code URL: https://github.com/matrix-org/matrix-hookshot
 
 matrix_hookshot_enabled: true
-
+matrix_hookshot_bot_localpart: "hookshot"
 matrix_hookshot_identifier: matrix-hookshot
 
 matrix_hookshot_container_image_self_build: false