Do not use deprecated node flag (#1413)

Author: alexslavr

packages/devextreme-angular-generator/package.json

@@ -13,7 +13,7 @@
     "dist"
   ],
   "scripts": {
-    "gulp": "npx --node-arg=--max_old_space_size=8048 gulp",
+    "gulp": "npx --node-options='--max_old_space_size=8048' gulp",
     "build": "npm run gulp -- build",
     "test": "npm run gulp -- test",
     "test:dev": "npm run gulp -- run.tests",