nixos.tests.installer.swraid: increase drive size

The latest staging caused this test not to fit anymore.
I'm all for keeping closure sizes under control,
but I don't think *this* is a good place.

nixos/tests/installer.nix

@@ -510,10 +510,10 @@ in {
               . " mklabel msdos"
               . " mkpart primary ext2 1M 100MB" # /boot
               . " mkpart extended 100M -1s"
-              . " mkpart logical 102M 1602M" # md0 (root), first device
-              . " mkpart logical 1603M 3103M" # md0 (root), second device
-              . " mkpart logical 3104M 3360M" # md1 (swap), first device
-              . " mkpart logical 3361M 3617M", # md1 (swap), second device
+              . " mkpart logical 102M 2102M" # md0 (root), first device
+              . " mkpart logical 2103M 4103M" # md0 (root), second device
+              . " mkpart logical 4104M 4360M" # md1 (swap), first device
+              . " mkpart logical 4361M 4617M", # md1 (swap), second device
               "udevadm settle",
               "ls -l /dev/vda* >&2",
               "cat /proc/partitions >&2",