fix: the environment variable is set incorrectly

[xionglinlin]

Change the colon to a semicolon

Log: as title

[deepin-ci-robot]

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This pull-request has been approved by: mhduiy, xionglinlin

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mhduiy, xionglinlin

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 修改了环境变量 QT_QPA_PLATFORM 的值，从 dxcb:xcb 改为 dxcb;xcb，可能影响应用程序的图形渲染方式。

是否建议立即修改:

• 否，这个改动看起来是一个配置上的调整，需要确认是否有相关的文档或测试用例来支持这个改动。如果这个改动是基于新的需求或测试结果，并且已经通过了充分的测试，那么可以保留这个改动。如果没有充分的理由或测试支持，建议先进行进一步的验证。