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refactor(immut): if-is for None=>() match in HAMT each helpers

Both `immut/hashset/HAMT.mbt` and `immut/hashmap/HAMT.mbt` had a noop-on-empty
match in their iteration helper:

```moonbit
match self.0 {
  None => ()
  Some(node) => go(node)
}
```

Replaced with the equivalent direct form:

```moonbit
if self.0 is Some(node) {
  go(node)
}
```

Both files share the exact same shape so bundled.

Semantics-preserving: full `moon test` (6425/6425) passes and `moon info`
produces no `.mbti` change.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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