Revert "fix test to use the same linear layer across metric_devices"

This reverts commit cb71355.

tests/ignite/metrics/test_hsic.py

@@ -137,11 +137,10 @@ def test_integration(self, sigma_x: float, sigma_y: float):
         if device.type != "xla":
             metric_devices.append(device)
 
-        lin = nn.Linear(n_dims_x, n_dims_y)
         for metric_device in metric_devices:
             x = torch.randn((n_iters * batch_size, n_dims_x)).float().to(device)
 
-            lin.to(device)
+            lin = nn.Linear(n_dims_x, n_dims_y).to(device)
             y = torch.sin(lin(x) * 100) + torch.randn(n_iters * batch_size, n_dims_y) * 1e-4
 
             def data_loader(i):