yast2-theme-breeze from openSUSE:Leap:15.6:Update project

需要 standard ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.6:Update/standard/openSUSE:Leap:15.6:Update.repo
zypper refresh
zypper install yast2-theme-breeze