fix(wechat app.config type fix): 修复微信小程序 app.config.ts 声明错误问题

[lichenbuliren]

如题，在使用过程中，发现针对微信小程序的 app.json TS 声明有误，这里提供修复后的代码

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[codecov]

Codecov Report

Merging #1257 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1257   +/-   ##
=======================================
  Coverage   95.37%   95.37%           
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  Files         350      350           
  Lines        3741     3741           
  Branches      566      566           
=======================================
  Hits         3568     3568           
  Misses        171      171           
  Partials        2        2           

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