fix: imporved-fluttium-driver

[B0yma]

How to run fluttium for web in branch - poc/imporved-fluttium-driver?

There is error -

Failed to get ready: ext.fluttium.ready: (-32603) Unexpected DWDS error for callServiceExtension: Unexpected error from chrome devtools:
text: Uncaught (in promise)
exception:
  preview: null
  description: null
  type: string
  value: Unexpected null value.
attempted JS eval: `require("dart_sdk").developer.invokeExtension(
    "ext.fluttium.ready", JSON.stringify({}));