Fix Windows UTF-16 translation buffer size - #1103
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Fixes #1092.
utf16_bufwas initialized as a two-element array ([0u16, 16]) while its length is passed toToUnicodeEx. Initialize the intended 16-element zeroed buffer so translations requiring more than two UTF-16 code unitshave sufficient capacity.
Tests:
cargo fmt --all -- --checkcargo check --locked --lib --no-default-features --features windows,eventscargo clippy --locked --lib --no-default-features --features windows,events -- -D warnings