chore(image): 官网taro的demo显示与h5不一致

[Alex-huxiyang]

突然发现之前调整的demo在官网显示和h5不一致，是由机器宽度有区别导致【360和375】，微调了demo的宽度，使其一致。https://nutui.jd.com/taro/react/2x/#/zh-CN/component/image

• [x] 站点、文档改进

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.84%. Comparing base (071f875) to head (3ce6e7d).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #2244   +/-   ##
=======================================
  Coverage   85.84%   85.84%           
=======================================
  Files         217      217           
  Lines       22830    22830           
  Branches     2480     2480           
=======================================
  Hits        19598    19598           
  Misses       3227     3227           
  Partials        5        5           

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