fix(SearchBar): cancel should blur. close #1721

[paranoidjk]

First of all, thank you for your contribution! :-)

Please makes sure that these checkboxes are checked before submitting your PR, thank you!

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Extra checklist:

if isBugFix :

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This change is 

[mention-bot]

@paranoidjk, thanks for your PR! By analyzing the history of the files in this pull request, we identified @pingan1927, @yiminghe and @warmhug to be potential reviewers.

[paranoidjk]

还测出来一个小的体验问题，clear 的时候光标先到最左边，内容后清除 （ios钱包内，chrome 模拟器没问题）

[codecov]

Codecov Report

Merging #1756 into 1.x will increase coverage by 0.02%.
The diff coverage is 20%.

@@            Coverage Diff             @@
##              1.x    #1756      +/-   ##
==========================================
+ Coverage   65.01%   65.03%   +0.02%     
==========================================
  Files         229      229              
  Lines        4487     4490       +3     
  Branches     1167     1169       +2     
==========================================
+ Hits         2917     2920       +3     
  Misses       1569     1569              
  Partials        1        1

Flag	Coverage Δ
#rn	65.19% <ø> (ø)	⬆️
#web	64.88% <20%> (+0.04%)	⬆️

Impacted Files	Coverage Δ
components/search-bar/index.web.tsx	76.41% <20%> (+0.68%)	⬆️

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[pingan1927]

动画的改动让然则重构一下，动画的实现比较重

[paranoidjk]

动画不在这个 PR 里改，这个只是恢复原有的行为，动画可以提个 issue 给 @warmhug