azure: stop carrying qemu-220 patch

nixos/modules/virtualisation/azure-image.nix

@@ -2,13 +2,13 @@
 
 with lib;
 let
-  diskSize = 30720;
+  diskSize = 2048;
 in
 {
   system.build.azureImage = import ../../lib/make-disk-image.nix {
     name = "azure-image";
     postVM = ''
-      ${pkgs.vmTools.qemu-220}/bin/qemu-img convert -f raw -o subformat=fixed -O vpc $diskImage $out/disk.vhd
+      ${pkgs.vmTools.qemu}/bin/qemu-img convert -f raw -o subformat=fixed,force_size -O vpc $diskImage $out/disk.vhd
     '';
     configFile = ./azure-config-user.nix;
     format = "raw";