fix: the base is duplicated in importAnalysisBuild.ts

[hex-ci]

Description

Fix a problem that the base is duplicated when importing css files dynamically.

Additional context

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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.

[crcong]

I think we can add some test cases to prevent regression.

[hex-ci]

@crcong Yes, there may be a lack of test cases, which is a small problem caused by the time difference of PR.

[patak-dev]

Thanks for tracking this down @hex-ci @crcong!
I think it would be good to add the test case as part of this PR as you suggested

[hex-ci]

@patak-js I fixed the problem of dynamically importing css test cases. Now the test cases can correctly judge whether css is successfully imported.

[hex-ci]

cc @antfu @Shinigami92

[hex-ci]

This is a serious bug that seems to affect more and more people who use dynamically imported .css files. @patak-js