fix: config is merged incorrectly

[TitusKirch]

Resolves #76

As a suggestion to solve the problem, I have created a custom defu. Here are the results and the matching test code.

Current result:

{
  "main": {
    "showTitle": true,
    "padded": false,
    "pm": [
      "npm",
      "pnpm",
      "npm",
      "pnpm",
      "bun",
      "yarn"
    ]
  }
}

After fix:

{
  "main": {
    "showTitle": true,
    "padded": false,
    "pm": [
      "npm",
      "pnpm"
    ]
  }
}

The test code:

const defaultConfig = {
  main: {
    showTitle: true,
    padded: true,
    pm: ['npm', 'pnpm', 'bun', 'yarn'],
  }
};
const localConfig = {
  main: {
    padded: false,
    pm: ['npm', 'pnpm'],
  }
};

const current = defu(localConfig, defaultConfig);
const afterFix = customDefu(localConfig, defaultConfig);
console.info('current', current);
console.info('afterFix', afterFix);

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[ZTL-UwU]

Thanks!