fix: apply condition skipped for nested plugins

[brillout]

Description

The code implementing the apply() condition is broken for nested plugins. This PR fixes it.

Additional context

The Vilay framework uses vite-plugin-ssr. Both use an array of plugins.

Se we end up with:

// vite.config.js (user config)
plugins: [vilay()]

// Vilay plugin
export function vilay(): Plugin[] {
  return [
    ssr() // vite-plugin-ssr
    // Vilay uses more plugins
    // ...
  ]
}

// vite-plugin-ssr plugin
export function ssr(): Plugin[] {
  return [
    // Uses several plugins
  ]
}

Vite receives a nested plugin array of depth 3.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

I don't think a test is worth it for this.

[patak-dev]

Thanks for the fix. Amazing that this wasn't discovered before.

@brillout I imagine you'll do it once you feel it is the right time, but I would love to read a blog post about the vite-plugin-ssr ecosystem and related projects.

[brillout]

@patak-dev Yes and, in general, writing more blog posts and focusing more on marketing/communication is something I'm looking forward to :-). And yea, as you rightfully imagined :-), I'll do it when the time is right.

(Btw. I will re-create the vite preview PR tentatively today / this weekend.)