fix: keep last_key_behavior after cancel selecting or entering

[kanru]

Fixes chewing/windows-chewing-tsf#556

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.07%. Comparing base (036d4c3) to head (ef1695d).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #794      +/-   ##
==========================================
+ Coverage   92.06%   92.07%   +0.01%     
==========================================
  Files          37       37              
  Lines        9253     9265      +12     
==========================================
+ Hits         8519     8531      +12     
  Misses        734      734              

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