fix: 去除webpack-plugin/index.js中对于loader插入的改动，完全由mpx-cli中进行相关loader注入

packages/webpack-plugin/lib/index.js

@@ -54,13 +54,11 @@ const wxssLoaderPath = normalize.lib('wxss/index')
 const wxmlLoaderPath = normalize.lib('wxml/loader')
 const wxsLoaderPath = normalize.lib('wxs/loader')
 const styleCompilerPath = normalize.lib('style-compiler/index')
-const styleStripConditaionalPath = normalize.lib('style-compiler/strip-conditional-loader')
 const templateCompilerPath = normalize.lib('template-compiler/index')
 const jsonCompilerPath = normalize.lib('json-compiler/index')
 const jsonThemeCompilerPath = normalize.lib('json-compiler/theme')
 const jsonPluginCompilerPath = normalize.lib('json-compiler/plugin')
 const extractorPath = normalize.lib('extractor')
-const selectorPath = normalize.lib('selector')
 const async = require('async')
 const { parseQuery } = require('loader-utils')
 const stringifyLoadersAndResource = require('./utils/stringify-loaders-resource')
@@ -1777,7 +1775,7 @@ try {
       })
 
       const typeLoaderProcessInfo = {
-        styles: ['node_modules/css-loader', wxssLoaderPath, styleCompilerPath, styleStripConditaionalPath],
+        styles: ['node_modules/css-loader', wxssLoaderPath, styleCompilerPath],
         template: ['node_modules/html-loader', wxmlLoaderPath, templateCompilerPath]
       }
 
@@ -1835,20 +1833,6 @@ try {
               loader: extractorPath
             })
           }
-          if (type === 'styles') {
-            // 判断最后一个loader是否是 selectorPath, 如果是，则在sectorPath之前插入strip-conditional
-            const lastLoader = loaders[loaders.length - 1]
-            if (lastLoader.loader.includes(selectorPath)) {
-              loaders.splice(loaders.length - 1, 0, {
-                loader: styleStripConditaionalPath
-              })
-            } else {
-              // 在最后一个插入strip-conditional
-              loaders.push({
-                loader: styleStripConditaionalPath
-              })
-            }
-          }
           createData.resource = addQuery(createData.resource, { mpx: MPX_PROCESSED_FLAG }, true)
         }
         // mpxStyleOptions 为 mpx style 文件的标识，避免 Vue 文件插入 styleCompiler 后导致 vue scoped 样式隔离失效