fix(hippy-vue): fixed focus event support for div

[xuqingkuang]

Before submitting a new pull request, please make sure:

• Test cases have been added/updated for the code you will submit.
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• Squash the repeat code commits, short patches are welcome.

[zoomchan-cxj]

LGTM

[codecov-io]

Codecov Report

Merging #387 into master will decrease coverage by 0.07%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #387      +/-   ##
==========================================
- Coverage   58.40%   58.33%   -0.08%     
==========================================
  Files          25       25              
  Lines        1647     1649       +2     
==========================================
  Hits          962      962              
- Misses        685      687       +2     

Impacted Files	Coverage Δ
packages/hippy-vue/src/elements/built-in.js	89.04% <0.00%> (-2.51%)	⬇️

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[zoomchan-cxj]

LGTM