fix: Fixed typing of bool in _ConvNd (#46828)

Summary:
Hello there 👋

I do believe there is some typo in the typing of the `bool` argument of `_ConvNd`constructor.
The typing of the attribute is correct, but the constructor argument, while being the same way, is not the value that will be assigned to `self.bias`.

This PR simply corrects that.

Any feedback is welcome!

Pull Request resolved: #46828

Reviewed By: izdeby

Differential Revision: D24550435

Pulled By: ezyang

fbshipit-source-id: ab10f1a5b29a912cb23fc321a51e78b04a8391e3

torch/nn/modules/conv.py

@@ -69,7 +69,7 @@ def __init__(self,
                  transposed: bool,
                  output_padding: _size_1_t,
                  groups: int,
-                 bias: Optional[Tensor],
+                 bias: bool,
                  padding_mode: str) -> None:
         super(_ConvNd, self).__init__()
         if in_channels % groups != 0: