Add receive_ephemeral everywhere de.sorunome.msc2409.push_ephemeral is used

Ref:

- 33f3ccd6ae/CHANGELOG.md (L134-L136)
- 7165d3fa58/appservice/registration.go (L30)

Intentionally not removing the old configuration setting yet, as some bridges may/do not support
the new setting name. It's likely just bridgev2 mautrix bridges that have been updated and support both right now.

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

@@ -212,6 +212,7 @@ matrix_mautrix_signal_registration_yaml: |
       - exclusive: true
         regex: '^@{{ matrix_mautrix_signal_appservice_bot_username | regex_escape }}:{{ matrix_mautrix_signal_homeserver_domain | regex_escape }}$'
   de.sorunome.msc2409.push_ephemeral: true
+  receive_ephemeral: true
   io.element.msc4190: {{ matrix_mautrix_signal_msc4190_enabled | to_json }}
 
 matrix_mautrix_signal_registration: "{{ matrix_mautrix_signal_registration_yaml | from_yaml }}"