sdk: fix replace_signatures for variable signer ordering (#1608) #456

Job	Run time
cargo-test-sbf (token/program)	8m 59s
check	3m 23s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	12m 59s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	17m 6s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 24s
test (single-pool/cli, single-pool/program)	17m 21s
cargo-test-sbf (token-upgrade/program)	9m 0s
test (token-upgrade/cli, token-upgrade/program)	15m 59s
cargo-test-sbf (feature-proposal/program)	9m 31s
cargo-test-sbf (governance/addin-mock/program, governance/program)	13m 14s
cargo-test-sbf (memo/program)	8m 22s
cargo-test-sbf (name-service/program)	8m 4s
cargo-test-sbf (stake-pool/program)	12m 56s
cargo-test-sbf (single-pool/program)	8m 36s
	2h 34m 54s

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