spend: a temporary partial fix for `LowestFee` #1599

Job	Run time
linter	40s
linter_gui	2m 33s
unit_tests (1.54, ubuntu-latest)	1m 54s
unit_tests (1.54, macOS-latest)	3m 18s
unit_tests (1.54, windows-latest)	3m 12s
unit_tests (nightly, ubuntu-latest)	56s
unit_tests (nightly, macOS-latest)	1m 38s
unit_tests (nightly, windows-latest)	1m 45s
unit_tests_gui (1.65, ubuntu-latest)	3m 44s
unit_tests_gui (1.65, macOS-latest)	3m 58s
unit_tests_gui (1.65, windows-latest)	5m 30s
unit_tests_gui (nightly, ubuntu-latest)	2m 39s
unit_tests_gui (nightly, macOS-latest)	3m 9s
unit_tests_gui (nightly, windows-latest)	4m 25s
	39m 21s

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