Do not put architecture stuff in matrix_mautrix_signal_version

.. because matrix_mautrix_signal_version is used in other places
which do not expect it. For example: `matrix_mautrix_signal_container_image_self_build_branch`

Related to: spantaleev#3041

roles/custom/matrix-bridge-mautrix-signal/defaults/main.yml

@@ -9,10 +9,11 @@ matrix_mautrix_signal_container_image_self_build_repo: "https://mau.dev/mautrix/
 matrix_mautrix_signal_container_image_self_build_branch: "{{ 'main' if matrix_mautrix_signal_version == 'latest' else matrix_mautrix_signal_version }}"
 
 # renovate: datasource=docker depName=dock.mau.dev/mautrix/signal
-matrix_mautrix_signal_version: 18e006300885e7432f0791211dec77345ae974a2-{{ matrix_architecture }}
+matrix_mautrix_signal_version: 18e006300885e7432f0791211dec77345ae974a2
 
 # See: https://mau.dev/mautrix/signal/container_registry
-matrix_mautrix_signal_docker_image: "{{ matrix_mautrix_signal_docker_image_name_prefix }}mautrix/signal:{{ matrix_mautrix_signal_version }}"
+matrix_mautrix_signal_docker_image: "{{ matrix_mautrix_signal_docker_image_name_prefix }}mautrix/signal:{{ matrix_mautrix_signal_docker_image_tag }}"
+matrix_mautrix_signal_docker_image_tag: "18e006300885e7432f0791211dec77345ae974a2-{{ matrix_architecture }}"
 matrix_mautrix_signal_docker_image_name_prefix: "{{ 'localhost/' if matrix_mautrix_signal_container_image_self_build else 'dock.mau.dev/' }}"
 matrix_mautrix_signal_docker_image_force_pull: "{{ matrix_mautrix_signal_docker_image.endswith(':latest') }}"