Fix storage expansion in pallet section #10883

Job	Run time
preflight / preflight	43s
preflight / ci-versions	1m 2s
check-runtime-migration (westend)	7m 52s
check-runtime-migration (rococo)	6m 35s
check-runtime-migration (asset-hub-westend)	5m 52s
check-runtime-migration (asset-hub-rococo)	6m 54s
check-runtime-migration (bridge-hub-westend)	5m 12s
check-runtime-migration (bridge-hub-rococo)	5m 3s
check-runtime-migration (contracts-rococo)	5m 4s
check-runtime-migration (collectives-westend)	5m 9s
check-runtime-migration (coretime-rococo)	5m 14s
All runtime migrations passed	1s
	54m 41s

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