sdk: fix conditional borsh usage in compute_budget.rs (#2221) #484

Job	Run time
check	2m 20s
cargo-test-sbf (token/program)	7m 46s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	16m 48s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 39s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	19m 41s
cargo-test-sbf (token-upgrade/program)	8m 29s
test (single-pool/cli, single-pool/program)	19m 3s
cargo-test-sbf (feature-proposal/program)	7m 28s
test (token-upgrade/cli, token-upgrade/program)	18m 27s
cargo-test-sbf (governance/addin-mock/program, governance/program)	21m 17s
cargo-test-sbf (memo/program)	8m 48s
cargo-test-sbf (name-service/program)	7m 41s
cargo-test-sbf (stake-pool/program)	13m 31s
cargo-test-sbf (single-pool/program)	9m 23s
	2h 51m 21s

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