rm a config line for a file that has been rm’ed

Vendor/md5.js doesn’t exist anymore, we get it from npm directly
So we don’t need this config line

Change-Id: Ib6de829e7d708d07d9a3bd5bc666ab8dc4e99a4a
Reviewed-on: https://gerrit.instructure.com/142824
Tested-by: Jenkins
Reviewed-by: Clay Diffrient <cdiffrient@instructure.com>
Product-Review: Ryan Shaw <ryan@instructure.com>
QA-Review: Ryan Shaw <ryan@instructure.com>

frontend_build/baseWebpackConfig.js

@@ -224,10 +224,6 @@ module.exports = {
         exclude: /public\/javascripts\/vendor/,
         loader: 'json-loader'
       },
-      {
-        test: /vendor\/md5/,
-        loader: 'exports-loader?CryptoJS'
-      },
       {
         test: /\.css$/,
         loader: 'style-loader!css-loader'