Update monai/losses/sure_loss.py

Signed-off-by: Jirka Borovec <6035284+Borda@users.noreply.github.com>

Author: Borda

monai/losses/sure_loss.py

@@ -150,7 +150,7 @@ def forward(
         x: torch.Tensor,
         y_pseudo_gt: torch.Tensor,
         y_ref: torch.Tensor | None = None,
-        complex_input: bool | None = False,
+        complex_input: bool = False,
     ) -> torch.Tensor:
         """
         Args: