Fix compatibility with nextcloud-vue > 3.9.0

The material design icon loaders were affected by a recent change and we
need to stop excluding them for the compilation to work again.

Signed-off-by: Vincent Petry <vincent@nextcloud.com>

webpack.common.js

@@ -42,9 +42,6 @@ module.exports = {
 			{
 				test: /\.vue$/,
 				loader: 'vue-loader',
-				exclude: babelLoaderExcludeNodeModulesExcept([
-					'vue-material-design-icons',
-				]),
 			},
 			{
 				test: /\.js$/,