[backport 1.28] Add additional check when restoring widgets_values (#6083)

Backport of #6054 to `core/1.28`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6083-backport-1-28-Add-additional-check-when-restoring-widgets_values-28e6d73d3650811f9730da120b3ec172)
by [Unito](https://www.unito.io)

Co-authored-by: AustinMroz <austin@comfy.org>

src/core/graph/subgraph/proxyWidget.ts

@@ -119,6 +119,7 @@ const onConfigure = function (
     this.properties.proxyWidgets = serialisedNode.properties.proxyWidgets
     const parsed = parseProxyWidgets(serialisedNode.properties.proxyWidgets)
     serialisedNode.widgets_values?.forEach((v, index) => {
+      if (parsed[index]?.[0] !== '-1') return
       const widget = this.widgets.find((w) => w.name == parsed[index][1])
       if (v !== null && widget) widget.value = v
     })