Update WAT format in several test cases

[larry0x]

In cosmwasm-vm, several WAT testdata include deprecated instruction names. For example get_local is now local.get. See: WebAssembly/spec#884

Recently, the Rust library wat dropped support for these deprecated instruction names: bytecodealliance/wasm-tools#1184. This repo currently uses wat 1.0.64, but if you upgrade to >=1.0.72 the tests will fail:

---- cache::tests::save_wasm_rejects_invalid_contract stdout ----
thread 'cache::tests::save_wasm_rejects_invalid_contract' panicked at packages/vm/src/cache.rs:631:57:
called `Result::unwrap()` on an `Err` value: Error { kind: Wast(Error { inner: ErrorInner { text: Some(Text { line: 3, col: 12, snippet: "            get_local $p0" }), file: None, span: Span { offset: 153 }, kind: Custom("unknown operator or unexpected token") } }) }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

These PR updates the instruction names to the standard ones.

[chipshort]

Thanks! I remember wondering about these aliases, but didn't know they were deprecated.