TST/BUG: integer coercion bool with int on windows

xref #12841

this is a test in `test_coercion.py, L361`

```
In [3]: import pandas as pd

In [4]: s = pd.Series([True, False, True, False])

In [5]: s.where(s,1)
Out[5]:
0    1
1    1
2    1
3    1
dtype: int32
```

on windows the scalar is not coerced to int64 (as it is on other platforms). IIRC `.where` already has quite complicated logic to do this. How simple is this to fix?

cc @sinhrks 
