Fix num_token_padding support for static per-tensor scaled_fp8_quant (#20188)

Signed-off-by: mgoin <mgoin64@gmail.com>

vllm/_custom_ops.py

@@ -1274,8 +1274,7 @@ def scaled_fp8_quant(
             scale = torch.zeros(1, device=input.device, dtype=torch.float32)
             torch.ops._C.dynamic_scaled_fp8_quant(output, input, scale)
     else:
-        # num_token_padding not implemented for this case
-        assert (scale.numel() == 1 and num_token_padding is None)
+        assert scale.numel() == 1
         torch.ops._C.static_scaled_fp8_quant(output, input, scale)
 
     return output, scale