chore(bridge-ui): fix configuredChains.json validation error for localhost setup

[aztecEagle22]

I was setting up the bridge UI to run on localhost and following the steps in the README.md, but I ran into this error when calling pnpm dev:

error when starting dev server:
Error: encoded configuredChains.json is not valid.
    ...
 ELIFECYCLE  Command failed with exit code 1.

I was pretty sure I filled everything out right, like this:

{
  "configuredChains": [
    {
      "167008": {
        "name": "Taiko Katla L2",
        "type": "L2",
        "icon": "",
        "urls": {
          "rpc": "https://rpc.katla.taiko.xyz",
          "explorer": "https://explorer.katla.taiko.xyz/"
        }
      }
    },
    ...
  ]
}

But it wasn't working.

So, I checked the schema in config/schemas/configuredChains.schema.json, made my config match it, and it started working. Turns out, there was this commit: d6ef79e that changed the schema but didn't update the sample config, which is why I was getting that error about configuredChains.json being invalid after filling it out.

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