Enable matrix_rageshake_enabled in the role by default

We disable it via `group_vars/matrix_servers`, as we do for all other
roles.

roles/custom/matrix-rageshake/defaults/main.yml

@@ -2,7 +2,7 @@
 # rageshake is a issue submission service from matrix.org
 # Project source code URL: https://github.com/matrix-org/rageshake/
 
-matrix_rageshake_enabled: false
+matrix_rageshake_enabled: true
 
 matrix_rageshake_container_image_self_build: false
 matrix_rageshake_docker_repo: "https://github.com/matrix-org/rageshake/"