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refactor(deque): pass the StringView separator straight to Iter::join

`Deque::join` materialized its `StringView` separator into an owned
`String` before handing it to `Iter::join`, which takes a `StringView` and
only reads it through `write_view`. That conversion is residue from before
a098d7373 widened `Iter::join` to `StringView` exactly so this call site no
longer needed the owning copy; `Array::join` and `ReadOnlyArray::join` already
forward their separator view unchanged.

Behavior is unchanged: the same front-to-back iteration feeds the same
`StringBuilder`, so output bytes, the n-1 separator insertions, empty deque ->
empty string and empty separator -> direct concatenation are identical. The
public signature is untouched, so `deque/pkg.generated.mbti` does not change.

Co-Authored-By: SeekMoon <seekmoon@moonbitlang.com>

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