fix: the return value of resolve by adding a namespace when processing a '@' in filter

[ygj6]

fixes #3532

Description

When the alias is equal to "@", the program will match "filter: / ^ [\ w @] [^:] /" and enter "build.onResolve". However, the return value of build.onResolve does not include the namespace, which causes the vue file to not be processed into HTML format.
After adding namespace in the return value of build.onResolve, the project work properly.

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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