windows: Remove `last_ime_input` (#10506)

It seems that windows always report IME composition string, so there is
no need to store this string manually.

Release Notes:

- N/A
58f57491b1张小白 committed on 4/15/2024, 7:08:38 PM· committed by GitHubparent3e44e97
1 file changedLine totals unavailable