Duplicated canonical URL tags are produced

**Describe the bug**

Two canonical tags are produced

**To Reproduce**

1.  Setup Nuxt and Nuxt page. Our guess is this is related to Nuxt full static mode

`nuxt.config.js`

```js
export default {
  mode: "universal",
  target: "static"
```

`pages/foo.vue`
```js
export default {
  head() {
    return this.$seo({
      title: "London",
    });
  }
}
```

2. Go to `foo` page



**Expected behavior**
No duplicated canonical URL tag should be produced in the DOM.

```html
<html>
  <head>
    <link data-n-head="ssr" rel="canonical" href="https://upmo.com/foo">
...
```

**Actual behavior**
Duplicated canonical URL tags are produced in the DOM.

```html
<html>
  <head>
    <link data-n-head="ssr" rel="canonical" href="https://upmo.com/">
    <link data-n-head="ssr" rel="canonical" href="https://upmo.com/foo">
...
```

**Additional context**

When we change the following code inside `module.js`
```js
this.options.head.link = createCanonical(options, '/').concat(this.options.head.link || [])
```

To become:
```js
this.options.head.link = this.options.head.link || []
```

It seems to have fixed the issue, but we're not sure what implication it will make.

P.S. Paired with @hsks

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Duplicated canonical URL tags are produced #87

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Duplicated canonical URL tags are produced #87

Description

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Metadata

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