Update deno task to not show commented out tasks

[dsherret]

          > The output shows the comments as comments. I'm not sure why someone would comment above a task and not want that displayed when someone runs deno task.

Well, let's say I have 3 tasks, but I want to disable, temporarily one of them for some reason.

{
  "tasks": {
    "format": "deno fmt .",
    // "lint": "deno lint .",
    "test": "deno test ."
  }
}

Now the commented lint task becomes the description of test task.

Originally posted by @oscarotero in #14949 (comment)

[dsherret]

Not relevant anymore