fix(ts-plugin): correct the language ID of the DTS virtual code

[johnsoncodehk]

In the context of Volar, the languageId of the virtual code should be used to represent the language of the virtual code rather than the language of the source code.

This will cause errors in language server, but there will be no problem in TS plugin.

[changeset-bot]

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Latest commit: 4b52baa

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[mizdra]

I see, that makes sense. Thanks for fixing it!

Since this change does not affect users, I merge without adding a changeset.