fix: should return the parse result in the compiler-sfc-shim (#5576)

Fixes #5574

Author: haoqunjiang

packages/@vue/cli-plugin-typescript/vue-compiler-sfc-shim.js

@@ -10,5 +10,7 @@ module.exports = {
     if (script) {
       script.start = script.loc.start.offset
     }
+
+    return result
   }
 }