CmdPal: Reorder dock network stats to match Task Manager order (#48098)

## Summary

Fixes #47939

The Performance Monitor dock band displayed network stats as Receive →
Send, but Task Manager shows Send → Receive. This swaps the order to
match Task Manager.

## Changes

- `PerformanceWidgetsPage.cs`: Swap `_networkUpItem` (Send) before
`_networkDownItem` (Receive) in the band items array.

Co-authored-by: root <root@io.bbq>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>