fix: wrong product icon size in DAboutDialog

[zty199]

when compiled with Qt6, product icon size is set to windowHandle().baseSize() which is not the same as compiled with Qt5 (fixed size 128x128)

Log: use 128x128 pixmap in DAboutDialog::setProductIcon

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: zty199

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[deepin-ci-robot]

Hi @zty199. Thanks for your PR. 😃

[deepin-ci-robot]

Hi @zty199. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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