viorng: Write both coinstallers to CoInstallers32 on one line
viorng: Write both coinstallers to CoInstallers32 on one line

The trick with using flag 0x00010008 in d56a0b6 didn't work. It is
not accepted by "Device Driver INF Verification Test(Certification)"
which now fails:
Flag 0x10000 must be specified for 'CoInstallers32' registry key

This commit goes back to using one logical line broken to two with
a backslash. The second physical line will be replaced by ; (semicolon)
when building for Win10 and the statement as a whole will still be valid.

Important: do not concatenate the two physical lines, Win10 builds
would lose the viorngci.dll part as well.

YanVugenfirer/virtio-win-arm,YanVugenfirer/kvm-guest-drivers-windows,virtio-win/kvm-guest-drivers-windows,gnif/kvm-guest-drivers-windows,YanVugenfirer/virtio-win-arm,YanVugenfirer/kvm-guest-drivers-windows,YanVugenfirer/virtio-win-arm,daynix/kvm-guest-drivers-windows,YanVugenfirer/kvm-guest-drivers-windows,gnif/kvm-guest-drivers-windows,daynix/kvm-guest-drivers-windows,virtio-win/kvm-guest-drivers-windows,ladipro/kvm-guest-drivers-windows,virtio-win/kvm-guest-drivers-windows,ladipro/kvm-guest-drivers-windows,daynix/kvm-guest-drivers-windows,vrozenfe/kvm-guest-drivers-windows,YanVugenfirer/kvm-guest-drivers-windows,daynix/kvm-guest-drivers-windows,vrozenfe/kvm-guest-drivers-windows,vrozenfe/kvm-guest-drivers-windows,YanVugenfirer/kvm-guest-drivers-windows,daynix/kvm-guest-drivers-windows,virtio-win/kvm-guest-drivers-windows,gnif/kvm-guest-drivers-windows,vrozenfe/kvm-guest-drivers-windows,YanVugenfirer/virtio-win-arm,virtio-win/kvm-guest-drivers-windows,gnif/kvm-guest-drivers-windows,ladipro/kvm-guest-drivers-windows,vrozenfe/kvm-guest-drivers-windows,ladipro/kvm-guest-drivers-windows