fix(templates): corejs@3, exports is not defined

重复编译了代码导致这个问题，也可以不使用corejs来解决

Author: deot

templates/babel.config.js

@@ -13,7 +13,8 @@ module.exports = (api) => {
 				{
 					useBuiltIns: "usage",
 					corejs: { 
-						version: 3
+						version: 3,
+						proposals: true
 					}
 				}
 			]

templates/config/webpack.config.common.js

@@ -43,7 +43,6 @@ const postcssLoader = {
 	}
 };
 const loaderPath = [
-	path.resolve(APP_ROOT, "node_modules/@wya/vc"),
 	path.resolve(APP_ROOT, "node_modules/fast-xml-parser"), // 第三方库未编译，导致iOS8不兼容
 	path.resolve(APP_ROOT, "src")
 ];