runtime: delete Stateful from SandboxConfig

Since all containers are started from shim v2, `Stateful` is not needed.

Fixes: #332

Signed-off-by: bin liu <bin@hyper.sh>

src/runtime/pkg/katautils/create.go

@@ -113,8 +113,6 @@ func CreateSandbox(ctx context.Context, vci vc.VC, ociSpec specs.Spec, runtimeCo
 		return nil, vc.Process{}, err
 	}
 
-	sandboxConfig.Stateful = true
-
 	if err := checkForFIPS(&sandboxConfig); err != nil {
 		return nil, vc.Process{}, err
 	}