fix(dts): force emit dts for build-in vue loader

[Teages]

resolve #249

see nuxt-contrib/vue-sfc-transformer#22 nuxt-contrib/vue-sfc-transformer#20

The new build-in loader will skip dts generation for .vue files which is no need to transfrom, this caused a regression in issue #249

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.64%. Comparing base (9000888) to head (aa87bea).
Report is 103 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #301      +/-   ##
==========================================
+ Coverage   82.86%   84.64%   +1.78%     
==========================================
  Files          12       12              
  Lines         852      977     +125     
  Branches      133      205      +72     
==========================================
+ Hits          706      827     +121     
- Misses        144      149       +5     
+ Partials        2        1       -1     

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