os: fix a typo in path_windows.go
I believe the path_windows.go file has a typo, which is fixed in this PR
Change-Id: Ibf1a7189a6312dbb3b1e6b512beeb6d99da5b5bc
GitHub-Last-Rev:
cedac7eaa07d26667e6800c5ac96239d5ccf6ba8
GitHub-Pull-Request: golang/go#53629
Reviewed-on: https://go-review.googlesource.com/c/go/+/415434
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>