Update the way boolean tensor are being printed (#22238)
Summary:
In case when the boolean tensor gets printed out, no need to specify the dtype.
Example:
```
>> x = torch.tensor([[True, True, True], [True, True, True]])
>> print(x)
tensor([[True, True, True],
[True, True, True]])
>> x = torch.tensor([True])
>> print(x)
tensor([True])
>> x = torch.tensor(True)
>> print(x)
tensor(True)
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22238
Differential Revision: D15996304
Pulled By: izdeby
fbshipit-source-id: 5699acf3e00abca8a2bbb5384f8271eeb063dce7
