spend: a temporary partial fix for `LowestFee` #1602

Job	Run time
linter	36s
linter_gui	2m 21s
unit_tests (1.54, ubuntu-latest)	2m 1s
unit_tests (1.54, macOS-latest)	2m 52s
unit_tests (1.54, windows-latest)	3m 5s
unit_tests (nightly, ubuntu-latest)	54s
unit_tests (nightly, macOS-latest)	2m 3s
unit_tests (nightly, windows-latest)	1m 35s
unit_tests_gui (1.65, ubuntu-latest)	3m 51s
unit_tests_gui (1.65, macOS-latest)	6m 10s
unit_tests_gui (1.65, windows-latest)	5m 25s
unit_tests_gui (nightly, ubuntu-latest)	2m 38s
unit_tests_gui (nightly, macOS-latest)	5m 44s
unit_tests_gui (nightly, windows-latest)	4m 23s
	43m 38s

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