virt-manager: fix wmclass

Use `dontWrapGApps` to prevent double wrapping from breaking wmclass

Fixes #150120

pkgs/applications/virtualization/virt-manager/default.nix

@@ -47,10 +47,14 @@ python3Packages.buildPythonApplication rec {
 
   setupPyGlobalFlags = [ "--no-update-icon-cache" ];
 
+  dontWrapGApps = true;
+
   preFixup = ''
     gappsWrapperArgs+=(--set PYTHONPATH "$PYTHONPATH")
     # these are called from virt-install in initrdinject.py
     gappsWrapperArgs+=(--prefix PATH : "${makeBinPath [ cpio e2fsprogs file findutils gzip ]}")
+
+    makeWrapperArgs+=("''${gappsWrapperArgs[@]}")
   '';
 
   checkInputs = with python3Packages; [ cpio cdrtools pytestCheckHook ];