Remove useless `matrix_static_files_client_redirect_root_uri_to_domain` variable definition

roles/custom/matrix-static-files/defaults/main.yml

@@ -407,10 +407,3 @@ matrix_static_files_self_check_hostname_identity: ''
 # As per the spec (https://matrix.org/docs/spec/client_server/r0.6.0#well-known-uri), it shouldn't be,
 # so we default to not following redirects as well.
 matrix_static_files_self_check_well_known_matrix_client_follow_redirects: none
-
-# TODO - review this one
-# Specifies where requests for the root URI (`/`) on the `matrix.` domain should be redirected.
-# If this has an empty value, they're just passed to the homeserver, which serves a static page.
-# If you'd like to make `https://matrix.example.com` redirect to `https://element.example.com` (or something of that sort), specify the domain name here.
-# Example value: `element.example.com` (or `{{ matrix_server_fqn_element }}`).
-matrix_static_files_client_redirect_root_uri_to_domain: ""