dapp: ignore order for CSS extractions

While building the dApp, the webpack plugin mini-css-extract-plugin is warning
us that the CSS order is not correct. Maintaining a clean order of the styling
sections is basically not possible in Vue. Therefore it makes sense to disable
this rule.

vuejs/vue-cli#3771

raiden-dapp/vue.config.js

@@ -78,6 +78,13 @@ module.exports = {
       enableInSFC: true,
     },
   },
+
+  css: {
+    extract: {
+      ignoreOrder: true,
+    },
+  },
+
   // check -> https://github.com/vuejs/vue-cli/issues/2978
   configureWebpack: (config) => {
     if (process.env.NODE_ENV === 'development') {