scripts/run_archiso.sh: change the default boot type to UEFI
It is more likely that the ISO will be booted on a UEFI system instead of legacy BIOS, so it makes sense to test if it boots on UEFI.
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It is more likely that the ISO will be booted on a UEFI system instead of legacy BIOS, so it makes sense to test if it boots on UEFI.