Prettier settings tweaks

Changes https://prettier.io/playground/ to have 4 space indentation by default and parens in all arrow functions.

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manifest.json

{
  "manifest_version": 2,
  "name": "Prettier settings tweaks",
  "description": "Changes prettier.io/playground/ to have 4 space indentation, and parens in all arrow functions.",
  "version": "0.5.0",
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "https://prettier.io/",
        "https://prettier.io/*"
      ],
      "js": [
        "PrettierSettingsTweaks.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2fc07efb-eae6-4c59-87b2-67ef2fce01a6}"
    }
  }
}