remove default project ID

Author: sycai

notebooks/visualization/visualization.ipynb

@@ -85,12 +85,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "id": "7cc6237d",
    "metadata": {},
    "outputs": [],
    "source": [
-    "PROJECT_ID = \"bigframes-dev\"  # @param {type:\"string\"}\n",
+    "PROJECT_ID = \"\"  # @param {type:\"string\"}\n",
     "REGION = \"US\"  # @param {type: \"string\"}"
    ]
   },