As part of new device verification, we were waiting for "cross-signing ready"
which means _both_ the public keys are trusted by this device _and_ private keys
are available. There's no guarantee that the private keys will ever arrive, so
it's too strict to wait for this as a blocking flow. This relaxes things to wait
only for the current device to trust public keys.
Fixes https://github.com/vector-im/element-web/issues/14970
dd87e9a2f1