Tidy up by using optional chaining

packages/builder/src/components/workflow/WorkflowBuilder/WorkflowBuilder.svelte

@@ -4,9 +4,8 @@
   import { notifier } from "builderStore/store/notifications"
   import Flowchart from "./flowchart/FlowChart.svelte"
 
-  $: workflow =
+  $: workflow = $workflowStore.selectedWorkflow?.workflow
-    $workflowStore.selectedWorkflow && $workflowStore.selectedWorkflow.workflow
+  $: workflowLive = workflow?.live
-  $: workflowLive = workflow && workflow.live
   $: instanceId = $backendUiStore.selectedDatabase._id
 
   function onSelect(block) {

packages/builder/src/components/workflow/WorkflowPanel/WorkflowList/WorkflowList.svelte

@@ -8,9 +8,7 @@
 
   const { open, close } = getContext("simple-modal")
 
-  $: selectedWorkflowId =
+  $: selectedWorkflowId = $workflowStore.selectedWorkflow?.workflow?._id
-    $workflowStore.selectedWorkflow &&
-    $workflowStore.selectedWorkflow.workflow._id
 
   function newWorkflow() {
     open(