grub2-theme-breeze from openSUSE:Leap:15.1 project

需要 standard ，用 root 執行：

zypper addrepo https://download.opensuse.org/repositories/openSUSE:Leap:15.1/standard/openSUSE:Leap:15.1.repo
zypper refresh
zypper install grub2-theme-breeze