make new queue panel disabled by default (#8444)

## Summary

Was enabled by default for 1.38 during nightly, but should be reverted
back now.

In the future we can now just use `isNightly` flag for this (ref:
https://github.com/Comfy-Org/ComfyUI_frontend/pull/8149)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8444-make-new-queue-panel-disabled-by-default-2f76d73d365081139b54f76d9325101d)
by [Unito](https://www.unito.io)

src/platform/settings/constants/coreSettings.ts

@@ -1178,7 +1178,7 @@ export const CORE_SETTINGS: SettingParams[] = [
     type: 'boolean',
     tooltip:
       'Replaces the floating job queue panel with an equivalent job queue embedded in the Assets side panel. You can disable this to return to the floating panel layout.',
-    defaultValue: true,
+    defaultValue: false,
     experimental: true
   },
   {