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

tests/ui_tests/fixtures.json

@@ -19605,7 +19605,7 @@
 "TT_en_test_msg_backup_device.py::test_backup_slip39_basic[click_info]": "65b98eb420a3b4a5128dc686f491a55b460205db7e1e1bb2828a3d6998af5466",
 "TT_en_test_msg_backup_device.py::test_backup_slip39_basic[no_click_info]": "a3c26090183f9b150cd0caccfa2a4ba9833de718868777cc1e6f255ddda8a94f",
 "TT_en_test_msg_backup_device.py::test_backup_slip39_custom[2_of_2]": "07c21a74ed24cb30259df4914998c965fc4152a6b99846141c88f91716be90b2",
-"TT_en_test_msg_backup_device.py::test_backup_slip39_custom[1_of_2]": "8ab2a9575d326c5578aa2b4ceca01e85d7e4c2b2454bdaef2378c5ac4d171df0",
+"TT_en_test_msg_backup_device.py::test_backup_slip39_custom[1_of_1]": "8ab2a9575d326c5578aa2b4ceca01e85d7e4c2b2454bdaef2378c5ac4d171df0",
 "TT_en_test_msg_backup_device.py::test_backup_slip39_custom[3_of_5]": "3f118cb683e5e43229a36a698d0aeb6bb4abce3592f929b95d67609275b71242",
 "TT_en_test_msg_backup_device.py::test_interrupt_backup_fails": "ae147498028d68aa71c7337544e4a5049c4c943897f905c6fe29e88e5c3ab056",
 "TT_en_test_msg_backup_device.py::test_no_backup_fails": "fada9d38ec099b3c6a4fd8bf994bb1f3431e40085128b4e0cd9deb8344dec53e",