removes unnecessary weight updates in WeightedShuffle::search #16488

Job	Run time
check (associated-token-account)	1m 11s
check (feature-proposal)	1m 27s
check (instruction-padding)	55s
check (memo)	1m 58s
check (record)	1m 55s
check (single-pool)	3m 13s
cargo-test-sbf (associated-token-account)	10m 30s
check (slashing)	1m 51s
cargo-test-sbf (feature-proposal)	8m 31s
check (stake-pool)	4m 22s
test_cli (single-pool)	18m 49s
cargo-test-sbf (instruction-padding)	6m 21s
check (token-2022)	4m 40s
test_cli (token-2022)	18m 41s
cargo-test-sbf (memo)	6m 51s
cargo-test-sbf (record)	9m 12s
cargo-test-sbf (single-pool)	7m 7s
cargo-test-sbf (slashing)	16m 5s
cargo-test-sbf (stake-pool)	10m 7s
cargo-test-sbf (token-2022)	6m 27s
	2h 20m 13s

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