fix: build rules not found Dtk namespace

[Yurii-huang]

1. change Dtk to DTK_GUI_NAMESPACE

[deepin-ci-robot]

Hi @Yurii-huang. Thanks for your PR.

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[Yurii-huang]

@deepin-mozart

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deepin-mozart, Yurii-huang

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