Fix self-build git ref for LiveKit JWT Service

matrix_livekit_jwt_service_container_repo_version interpolated
livekit_server_version (the LiveKit Server role's version) instead of
this role's own matrix_livekit_jwt_service_version, so self-builds
checked out the wrong git tag.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

roles/custom/matrix-livekit-jwt-service/defaults/main.yml

@@ -29,7 +29,7 @@ matrix_livekit_jwt_service_version: 0.5.0
 
 matrix_livekit_jwt_service_container_image_self_build: false
 matrix_livekit_jwt_service_container_repo: "https://github.com/element-hq/lk-jwt-service.git"
-matrix_livekit_jwt_service_container_repo_version: "{{ 'main' if matrix_livekit_jwt_service_version == 'latest' else ('v' + livekit_server_version) }}"
+matrix_livekit_jwt_service_container_repo_version: "{{ 'main' if matrix_livekit_jwt_service_version == 'latest' else ('v' + matrix_livekit_jwt_service_version) }}"
 matrix_livekit_jwt_service_container_src_files_path: "{{ matrix_livekit_jwt_service_base_path }}/container-src"
 
 matrix_livekit_jwt_service_container_image: "{{ matrix_livekit_jwt_service_container_image_registry_prefix }}element-hq/lk-jwt-service:{{ matrix_livekit_jwt_service_container_image_tag }}"