Fix variable name in solution JSON file check and update plot save path

Author: markcoletti

examples-proposed/024-aggregated-compute-ensemble/input_dir/instance_base_notebook.ipynb

@@ -43,7 +43,7 @@
     "# arrays, `x` and `u`, which we will plot.\n",
     "solution_json_file = list(Path(\"..\").rglob(\"*solution.json\"))\n",
     "\n",
-    "if len(solution_json) != 1:\n",
+    "if len(solution_json_file) != 1:\n",
     "    raise RuntimeError(\n",
     "        f\"Expected exactly one solution JSON file, found {len(solution_json_file)}\"\n",
     "    )\n",
@@ -62,7 +62,7 @@
     "plt.ylabel(\"Temperature (u)\")\n",
     "plt.title(\"Solution of 1D Heat Equation\")\n",
     "plt.grid(True)\n",
-    "plt.savefig(f\"{instance}_solution.png\")"
+    "plt.savefig(f\"solution.png\")"
    ],
    "id": "b1a40da330ba6b3e",
    "outputs": [],