fix wqkv dim when enable qkv fusion

[sallyjunjun]

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Motivation

fix wqkv dim when enable qkv fusion

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

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Use cases (Optional)

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Checklist

Before PR:

• [ ] Pre-commit or other linting tools are used to fix the potential lint issues.
• [ ] Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• [ ] The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• [ ] The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• [ ] If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects.
• [ ] CLA has been signed and all committers have signed the CLA in this PR.