nixos/testing: use the same qemu in the test driver

The qemu_test package is also used for running a NixOS qemu VM.

nixos/lib/testing.nix

@@ -29,7 +29,7 @@ rec {
         cp ${./test-driver/Logger.pm} $libDir/Logger.pm
 
         wrapProgram $out/bin/nixos-test-driver \
-          --prefix PATH : "${lib.makeBinPath [ qemu vde2 netpbm coreutils ]}" \
+          --prefix PATH : "${lib.makeBinPath [ qemu_test vde2 netpbm coreutils ]}" \
           --prefix PERL5LIB : "${with perlPackages; lib.makePerlPath [ TermReadLineGnu XMLWriter IOTty FileSlurp ]}:$out/lib/perl5/site_perl"
       '';
   };