fix: dtk6 theme is not dxcb style on openSUSE and Gentoo

[hillwoodroc]

Log: Try to fix linuxdeepin/developer-center#9493

[deepin-ci-robot]

Hi @hillwoodroc. Thanks for your PR. 😃

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[deepin-bot]

TAG Bot

New tag: 1.2.12
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #87

[deepin-bot]

TAG Bot

New tag: 1.2.13
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #90

[deepin-bot]

TAG Bot

New tag: 1.2.14
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #93

[felixonmars]

Applied in Arch package, works as expected 👍

[deepin-bot]

TAG Bot

New tag: 1.99.3
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #101

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, felixonmars, hillwoodroc

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[BLumia]

Context:

@felixonmars :
看起来deepin用的Xsession.d是debian-only的行为
https://salsa.debian.org/xfce-extras-team/lightdm/-/blob/debian/master/debian/01_debian.conf
所以其他发行版不会执行 /etc/X11/Xsession.d，因此少了这些环境变量
在debian给lightdm的配置里，文件名也带debian