Fix extract script for dictionary files

On Windows, previous script didn't make sense.

scripts/extract_dict.js

@@ -0,0 +1,16 @@
+/* eslint-disable no-process-exit */
+
+const {spawn} = require('child_process');
+const {path7za} = require('7zip-bin');
+
+const cwd = process.argv[2];
+
+spawn(path7za, ['e', '-y', '*.zip'], {
+  cwd,
+  stdio: 'inherit'
+}).on('error', (err) => {
+  console.error(err);
+  process.exit(1);
+}).on('close', (code) => {
+  process.exit(code);
+});