Fix issues with Japanese & Vietnamese IME

[lhecker]

This commit builds directly on the changes made in #13677 and fixes:

• TSF resetting to AlphaNumeric ("ASCII") input mode when pressing enter
• Vietnamese IME not composing a new word after pressing whitespace, etc.

Closes #11479 Closes #13398

Validation Steps Performed

• Japanese IME (Full-Width Katakana) Typing "saitama" produces "サイタマ" ✅
• Korean IME Typing "gksrmf" produces "한글" ✅
• Vietnamese IME Typing "xin chaof" produces "xin chào" ✅
• Emoji Picker (Win+.) ✅

[lhecker]

I wasn't sure whether I should integrate these changes into the changes made in #13677. I guess keeping it seperate has the benefit of being easier to backport if we don't trust the changes in the other PR. 🙂

[DHowett]

This needs a merge or rebase

[zadjii-msft]

(this is a test)

@msftbot merge this after #13707 merges

[ghost]

Hello @zadjii-msft!

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[ghost]

:tada:Windows Terminal Preview v1.15.228 has been released which incorporates this pull request.:tada:

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