fixes spl system program invalid bytes issue

[dkdocs]

These are the bytes not able to parse via CreateAccountWithSeedLayout::deserialize(rest_bytes)

----------- BLOCK #263,852,688 (6kqyzFS7yfj9rJNdQ7oWxivUkwC3fEwd6NsbAGgzT2ty) ---------------
map_block: log: Deserialization error: [189, 22, 52, 124, 240, 29, 31, 0, 0, 0, 0, 0, 165, 0, 0, 0, 0, 0, 0, 0, 6, 221, 246, 225, 215, 101, 161, 147, 217, 203, 225, 70, 206, 235, 121, 172, 28, 180, 133, 237, 95, 91, 55, 145, 58, 140, 245, 133, 126, 255, 0, 169]

map_block: log: Deserialization error: [191, 189, 113, 70, 64, 132, 190, 4, 0, 0, 0, 0, 44, 44, 0, 0, 0, 0, 0, 0, 13, 7, 81, 168, 40, 45, 166, 19, 5, 254, 41, 156, 55, 185, 152, 229, 132, 113, 219, 17, 53, 3, 115, 16, 248, 190, 16, 69, 166, 10, 246, 238]

map_block: log: Deserialization error: [191, 189, 67, 123, 64, 15, 20, 6, 0, 0, 0, 0, 188, 56, 0, 0, 0, 0, 0, 0, 13, 7, 81, 168, 40, 45, 166, 19, 5, 254, 41, 156, 55, 185, 152, 229, 132, 113, 219, 17, 53, 3, 115, 16, 248, 190, 16, 69, 166, 10, 246, 238]

Generating this error

ERRO (cli) application shutdown unexpectedly, quitting: stream invalid: rpc error: code = InvalidArgument desc = rpc error: code = InvalidArgument desc = step new irr: handler step new: execute modules: applying executor results "map_block" on block 263852688: execute: maps wasm call: block 263852688: module "map_block": general wasm execution panicked: wasm execution failed deterministically: panic in the wasm: "called `Result::unwrap()` on an `Err` value: Custom { kind: InvalidData, error: \"incomplete utf-8 byte sequence from index 4\" }" at src/instructions/parser.rs:37:74