chore: avoid watching 'node_modules' files in client WASM test servers

Author: jpraynaud

mithril-client-wasm/www-test/webpack.config.js

@@ -18,4 +18,7 @@ module.exports = {
   experiments: {
     asyncWebAssembly: true,
   },
+  watchOptions: {
+    ignored: /node_modules/,
+  },
 };

mithril-client-wasm/www/webpack.config.js

@@ -19,4 +19,7 @@ module.exports = {
   devServer: {
     allowedHosts: [".mithril.network"],
   },
+  watchOptions: {
+    ignored: /node_modules/,
+  },
 };