fix(build): respect productionSourceMap option for all targets

close #1898

Author: yyx990803

packages/@vue/cli-service/lib/config/prod.js

@@ -11,7 +11,7 @@ module.exports = (api, options) => {
 
       webpackConfig
         .mode('production')
-        .devtool('source-map')
+        .devtool(options.productionSourceMap ? 'source-map' : false)
         .output
           .filename(filename)
           .chunkFilename(filename)