fixup! fixup! feat(core): add ability to request backups with any number of groups/shares.

tests/device_tests/test_msg_backup_device.py

@@ -138,7 +138,10 @@ def test_backup_slip39_custom(client: Client, share_threshold, share_count):
     assert client.features.no_backup is False
 
     assert len(IF.mnemonics) == share_count
-    assert shamir.combine_mnemonics(IF.mnemonics[-share_threshold:]).hex() == MNEMONIC_SLIP39_CUSTOM_SECRET
+    assert (
+        shamir.combine_mnemonics(IF.mnemonics[-share_threshold:]).hex()
+        == MNEMONIC_SLIP39_CUSTOM_SECRET
+    )
 
 
 # we only test this with bip39 because the code path is always the same