vulkan-validationlayers from home:thehejik project

For openSUSE Leap 15.2 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:thehejik/openSUSE_Leap_15.2/home:thehejik.repo
zypper refresh
zypper install vulkan-validationlayers

For 15.3 run the following as root:

zypper addrepo https://download.opensuse.org/repositories/home:thehejik/15.3/home:thehejik.repo
zypper refresh
zypper install vulkan-validationlayers