Typo in `_GUARD_BOTH_UNICODE` dsl

# Bug report

### Bug description:

There appears to be a typo in the `optimizer_bytecodes` for `_GUARD_BOTH_UNICODE` where the right operand is not getting checked:

https://github.com/python/cpython/blob/5e73ece95e8aa92d0695acb039ef54e2103ce66b/Python/optimizer_bytecodes.c#L163-L169

Original change from gh-118910:

https://github.com/python/cpython/pull/118913/files#diff-e5bd2b14b0b10f0f47786e26306d689ed1361c3dc3b11dcc3ea52b8a2422ff64L151-R141

N.b. I'm not very familiar with this part of the code-base and just happened to stumble upon this when studying through it; apologies if I misunderstood something 🙏 

### CPython versions tested on:

3.14, CPython main branch

### Operating systems tested on:

_No response_


### Linked PRs
* gh-130904

	op(_GUARD_BOTH_UNICODE, (left, right -- left, right)) {
	if (sym_matches_type(left, &PyUnicode_Type) &&
	sym_matches_type(right, &PyUnicode_Type)) {
	REPLACE_OP(this_instr, _NOP, 0 ,0);
	}
	sym_set_type(left, &PyUnicode_Type);
	sym_set_type(left, &PyUnicode_Type);

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