fix: remove the num_template_per_step param in the ui notebook

gemini/prompts/prompt_optimizer/vertex_ai_prompt_optimizer_ui.ipynb

@@ -271,7 +271,6 @@
       "source": [
         "# @markdown **Instruction Optimization Configs**: <br/>\n",
         "NUM_INST_OPTIMIZATION_STEPS = 10  # @param {type:\"integer\"}\n",
-        "NUM_TEMPLATES_PER_STEP = 2  # @param {type:\"integer\"}\n",
         "\n",
         "# @markdown **Demonstration Optimization Configs**: <br/>\n",
         "NUM_DEMO_OPTIMIZATION_STEPS = 10  # @param {type:\"integer\"}\n",
@@ -294,9 +293,7 @@
         "\n",
         "# @markdown **Misc Configs**: <br/>\n",
         "PLACEHOLDER_TO_VALUE = \"{}\"  # @param\n",
-        "RESPONSE_MIME_TYPE = (\n",
-        "    \"text/plain\"  # @param [\"text/plain\", \"application/json\", \"text/x.enum\"]\n",
-        ")\n",
+        "RESPONSE_MIME_TYPE = \"text/plain\"  # @param [\"text/plain\", \"application/json\", \"text/x.enum\"]\n",
         "RESPONSE_SCHEMA = \"\"\n",
         "TARGET_LANGUAGE = \"English\"  # @param [\"English\", \"French\", \"German\", \"Hebrew\", \"Hindi\", \"Italian\", \"Japanese\", \"Korean\", \"Portuguese\", \"Simplified Chinese\", \"Spanish\", \"Traditional Chinese\"]\n",
         "TOOLS = \"\"  # @param\n",
@@ -365,7 +362,6 @@
         "    \"demo_set_size\": NUM_DEMO_PER_PROMPT,\n",
         "    \"aggregation_type\": METRIC_AGGREGATION_TYPE,\n",
         "    \"data_limit\": 50,\n",
-        "    \"num_template_eval_per_step\": NUM_TEMPLATES_PER_STEP,\n",
         "    \"input_data_path\": input_data_path,\n",
         "    \"output_path\": output_path,\n",
         "    \"response_mime_type\": RESPONSE_MIME_TYPE,\n",