cmd/go: remove windows Skip in test that wasn't removed

Was supposed to be removed from CL 123757

Change-Id: I74405adab58be103f8e4a0c2405567f480a0e622
Reviewed-on: https://go-review.googlesource.com/123895
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Bryan C. Mills <bcmills@google.com>

src/cmd/go/mod_test.go

@@ -12,7 +12,6 @@ import (
 	"os/exec"
 	"path/filepath"
 	"regexp"
-	"runtime"
 	"sort"
 	"strings"
 	"testing"
@@ -214,10 +213,6 @@ func TestModFindModulePath(t *testing.T) {
 		t.Fatalf("FindModulePath = %q, %v, want %q, nil", path, err, "unexpected.com/z")
 	}
 
-	if runtime.GOOS == "windows" {
-		t.Skipf("windows removeall fails")
-	}
-
 	// Empty dir outside GOPATH
 	tg.must(os.MkdirAll(tg.path("gp1"), 0777))
 	tg.must(os.MkdirAll(tg.path("x1"), 0777))