Fix treasury benchmarks when no SpendOrigin #8497

Job	Run time
set-image	9s
check-runtime-migration (westend)	7m 57s
check-runtime-migration (rococo)	5m 44s
check-runtime-migration (asset-hub-westend)	4m 58s
check-runtime-migration (asset-hub-rococo)	6m 6s
check-runtime-migration (bridge-hub-westend)	4m 5s
check-runtime-migration (bridge-hub-rococo)	4m 14s
check-runtime-migration (contracts-rococo)	4m 14s
check-runtime-migration (collectives-westend)	4m 16s
check-runtime-migration (coretime-rococo)	4m 25s
All runtime migrations passed	1s
	46m 9s

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