fix(input): keep shift on letters that report only an alternate codepoint

[farzadmf]

WezTerm kitty mode sends shift+ with no SHIFT bit, only the uppercase alternate codepoint, so it matched the unshifted binding.

Fixes #2435

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[kangal-bot]

Hi @farzadmf, thanks for your interest in contributing.

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[farzadmf]

Hopelessly pinging @ogulcancelik similar to #2270 as this is a big blocker for me on Wezterm

EDIT: by "similar to ...", I mean I think pinging you allowed the PR to go through, hopefully same will happen to this