Remove duplicate matrix_media_repo_identifier definition from group_vars/matrix_servers

`matrix_media_repo_identifier` is already defined in the role defaults,
which is a better role to have it anyway.

group_vars/matrix_servers

@@ -2693,8 +2693,6 @@ matrix_ma1sd_database_password: "{{ '%s' | format(matrix_homeserver_generic_secr
 #
 ######################################################################
 
-matrix_media_repo_identifier: matrix-media-repo
-
 matrix_media_repo_enabled: false
 matrix_media_repo_container_network: "{{ matrix_nginx_proxy_container_network if matrix_playbook_reverse_proxy_type == 'playbook-managed-nginx' else matrix_media_repo_identifier }}"
 

roles/custom/matrix-media-repo/defaults/main.yml

@@ -9,7 +9,7 @@ matrix_media_repo_enabled: false
 
 # matrix_media_repo_identifier controls the identifier of this media-repo instance, which influences:
 # - the default storage path
-# - the names of systemd services
+# - the names of systemd services and containers
 matrix_media_repo_identifier: matrix-media-repo
 
 matrix_media_repo_container_image_self_build: false