入力補完の外をタップしたときにフォーカスを外す

[poppingmoon]

Fix #450

入力補完をTextFieldTapRegionで囲むことで入力欄と入力補完以外をタップしたときにフォーカスを外すようにしました

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 88.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 27.75%. Comparing base (8512cea) to head (f05eec9).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ib/view/common/note_create/input_completation.dart	88.00%	3 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #472      +/-   ##
===========================================
+ Coverage    27.73%   27.75%   +0.01%     
===========================================
  Files          312      312              
  Lines        16296    16299       +3     
===========================================
+ Hits          4520     4523       +3     
  Misses       11776    11776              

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