fix(vite:build-html): normalized output log

[xieyhn]

Description

Normalize log output when nested html files are used as entry points.

// vite.config.ts
import path from 'path'
import { defineConfig } from 'vite'

export default defineConfig({
  build: {
    rollupOptions: {
      input: {
        main: path.resolve(__dirname, 'nested/index.html')
      }
    }
  }
})

Run vite build, output(Windows):

vite v3.0.4 building for production...
✓ 1 modules transformed.
Generated an empty chunk: "main"
- dist/nested\index.html   0.26 KiB
+ dist/nested/index.html   0.26 KiB

Additional context

---

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.