Fix sharing device keys

Author: tulir

mautrix/crypto/account.py

@@ -82,7 +82,7 @@ def get_device_keys(self, user_id: UserID, device_id: DeviceID) -> DeviceKeys:
             device_id=device_id,
             algorithms=[EncryptionAlgorithm.OLM_V1, EncryptionAlgorithm.MEGOLM_V1],
             keys={
-                KeyID(algorithm=EncryptionKeyAlgorithm(algorithm), key_id=key): key
+                KeyID(algorithm=EncryptionKeyAlgorithm(algorithm), key_id=device_id): key
                 for algorithm, key in self.identity_keys.items()
             },
             signatures={},