chore(test): Improve new input flow function name and add missing UI fixture

[no changelog]

tests/device_tests/ethereum/test_signtx.py

@@ -396,7 +396,7 @@ def test_signtx_data_pagination(client: Client, flow):
 
 
 @pytest.mark.skip_t1
-def test_ethereum_sign_erc20_approve(client: Client):
+def test_signtx_erc20_approve(client: Client):
     with client:
         client.watch_layout()
         IF = InputFlowErc20Approve(client)

tests/ui_tests/fixtures.json

@@ -2768,6 +2768,7 @@
 "TT_ethereum-test_signtx.py::test_signtx_data_pagination[input_flow_go_back]": "8de2c846062d9b028ba23c02d9a53c54ef2fc55d377f084a43bc5d77be56e458",
 "TT_ethereum-test_signtx.py::test_signtx_data_pagination[input_flow_scroll_down]": "ed6c9e088a12ea2e673dbcc99944aa5d6fd6e02e579442d908a3f3e245214145",
 "TT_ethereum-test_signtx.py::test_signtx_data_pagination[input_flow_skip]": "d3c5c78e3b92dc3e32fd8d0c1a4b02ed9d826caf2d0e140c604c50ba39158082",
+"TT_ethereum-test_signtx.py::test_signtx_erc20_approve": "56e917fc22a2d2b817ddf12af634e59076553d161b4ac403a822adf4a672fb70",
 "TT_ethereum-test_signtx.py::test_signtx_eip1559[Ledger Live legacy path]": "6dafe7c724f262a4fff5448b475ce848d3a74f76cb0ebaf60a5eb83bd20abb82",
 "TT_ethereum-test_signtx.py::test_signtx_eip1559[data_1]": "2eb0129b9fd3c9123920b8f47d3150b0023f4455aa171b76c5e82c17f2747cc9",
 "TT_ethereum-test_signtx.py::test_signtx_eip1559[data_2_bigdata]": "f9fff4dd81fbe5d950a7e699afbb58a8b2e8a87423ea10e25906f21d1c769dd4",