fix: revert "fix: Fix sandbox URL in getSandboxUrl function"

[Mobyrr]

Reverts histoire-dev/histoire#652

Description

Fix stories in iframes not showing when the base have a slash at the end.

Additional context

The base url should have a slash at the start and at the end (every guides for configuring the base url have them, for example : https://vitejs.dev/config/shared-options.html#base)

If the base doesn't have the slash at the end, the build produce a bad result, it doesn't find js and css files because a slash is missing in the urls

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[Akryum]

After looking around (for example in vitepress), Vite's base should be concatenated as-is like it was before the referenced PR.