fix workflow widget notebook

Author: nvaytet

docs/user-guide/loki/workflow-widget-loki.ipynb

@@ -60,10 +60,10 @@
     "pbox = wfw.parameter_box\n",
     "pbox.parameter_refresh_button.click()\n",
     "# Enable DirectBeam input\n",
-    "pbox._input_widgets[DirectBeam].children[0].enabled = True\n",
-    "pbox._input_widgets[DirectBeam].children[0].wrapped._option_box.value = None\n",
+    "pbox._input_widgets[DirectBeam].children[0].value = True\n",
+    "pbox._input_widgets[DirectBeam].children[1].children[1]._option_box.value = None\n",
     "# Adjust Q range\n",
-    "pbox._input_widgets[QBins].children[0].fields[\"start\"].value = 0.01\n",
+    "pbox._input_widgets[QBins].fields[\"start\"].value = 0.01\n",
     "# Run the workflow\n",
     "rbox = wfw.result_box\n",
     "rbox.run_button.click()"