fix(web-types): v-model:x can't generate correct web-types

[Ulyssesyi]

vant-cli生成的web-types错误，将v-model:show等当成了普通变量处理
从而导致IDE提示异常

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.95%. Comparing base (ec5b45b) to head (c2f4367).
⚠️ Report is 201 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13735      +/-   ##
==========================================
+ Coverage   89.60%   89.95%   +0.34%     
==========================================
  Files         257      257              
  Lines        7013     7056      +43     
  Branches     1736     1749      +13     
==========================================
+ Hits         6284     6347      +63     
+ Misses        384      372      -12     
+ Partials      345      337       -8     

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