test: Remove from_node from create_self_transfer* MiniWallet helpers

Summary:
The from_node argument is no longer used as of D12733

Remove also the unused from_node and wallet arguments in a helper function feature_cltv.py

This is a backport of core#25435

Depends on D16022

Test Plan:
ninja check-functional-extended

cmake .. -GNinja -DENABLE_TRACING=1
ninja
sudo ./test/functional/test_runner.py interface_usdt_net
sudo ./test/functional/test_runner.py interface_usdt_utxocache
sudo ./test/functional/test_runner.py interface_usdt_validation

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D16021