Remove unnecessary unwrap from `simulate_transaction_unchecked()` #7903

Job	Run time
cargo-test-sbf (token/program)	7m 45s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 45s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 36s
check	0s
cargo-test-sbf (token-upgrade/program)	9m 1s
test	0s
cargo-test-sbf (feature-proposal/program)	8m 50s
cargo-test-sbf (governance/addin-mock/program, governance/program)	11m 47s
cargo-test-sbf (memo/program)	8m 3s
cargo-test-sbf (name-service/program)	8m 26s
cargo-test-sbf (stake-pool/program)	11m 38s
cargo-test-sbf (single-pool/program)	9m 46s
	1h 38m 37s

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