KVM: X86: Fix kvm_bitmap_or_dest_vcpus() to use irq shorthand

The 3rd parameter of kvm_apic_match_dest() is the irq shorthand,
rather than the irq delivery mode.

Fixes: 7ee30bc1 ("KVM: x86: deliver KVM IOAPIC scan request to target vCPUs")
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>