Fix up 'settings' section of '.eslintrc.js'

[chris-pearce]

Point it to the webpack config. Relevant code:

settings: {
    // This is needed to stop VS Code from reporting that it cannot find modules
    // https://github.com/benmosher/eslint-plugin-import/issues/799
    // https://github.com/AtomLinter/linter-eslint/issues/610
    'import/resolver': {
      node: {
        paths: [
          path.resolve(__dirname, './src'),
          path.resolve(__dirname, './src/assets'),
        ],
      },
    },
  },

import-js/eslint-plugin-import#799
AtomLinter/linter-eslint#610