fix .eslint.js

I fixed .eslint.js as below.
I also changed new linecode of .eslint.js from LF to CRLF (I'm using Windows) at the bottom botton.

module.exports = {
  env: {
    browser: true,
    es2021: true,
    node: true
  },
  extends: [
    "standard"
  ],
  parserOptions: {
    ecmaVersion: 12
  },
  rules: {
    indent: [
      "error",
      2,
      { SwitchCase: 1 }
    ],
    "linebreak-style": [
      "error",
      "windows"
    ],
    quotes: [
      "error",
      "double"
    ],
    semi: [
      "error",
      "always"
    ],
    "no-unused-vars": [
      "error",
      {
        vars: "all",
        args: "none"
      }
    ],
    "no-console": [
      "off"
    ]
  }
};