Support both the im.vector.riot and io.element variants in client .well-known

According to the docs, "e2ee" is already under "io.element":
  https://github.com/vector-im/element-web/blob/develop/docs/e2ee.md#disabling-encryption-by-default
however "jitsi" is still under "im.vector.riot":
  https://github.com/vector-im/element-web/blob/develop/docs/jitsi.md#configuring-element-to-use-your-self-hosted-jitsi-server

For now let's just maintain backward and forward compatibility for both
settings since the client version is out of the control of this
playbook.

roles/matrix-base/templates/static-files/well-known/matrix-client.j2

@@ -19,11 +19,17 @@
 	}
 	{% endif %}
 	{% if matrix_client_element_jitsi_preferredDomain %},
+	"io.element.jitsi": {
+		"preferredDomain": {{ matrix_client_element_jitsi_preferredDomain|to_json }}
+	},
 	"im.vector.riot.jitsi": {
 		"preferredDomain": {{ matrix_client_element_jitsi_preferredDomain|to_json }}
 	}
 	{% endif %}
 	{% if not matrix_client_element_e2ee_default %},
+	"io.element.e2ee": {
+		"default": false
+	},
 	"im.vector.riot.e2ee": {
 		"default": false
 	}