cmd/callgraph: unskip TestCallgraph on windows/arm64

This reverts commit 7d125fe.

Windows/arm64 builders have been migrated to Azure
using Windows ARM64 hosts instead of qemu + Mac. Let's see if the
issue still reproduces.

Change-Id: I2c55812c9eb9710ac2849e65987f55baf7766b13
Reviewed-on: https://go-review.googlesource.com/c/tools/+/559115
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>

cmd/callgraph/main_test.go

@@ -15,7 +15,6 @@ import (
 	"log"
 	"os"
 	"path/filepath"
-	"runtime"
 	"strings"
 	"testing"
 
@@ -35,10 +34,6 @@ func init() {
 }
 
 func TestCallgraph(t *testing.T) {
-	if runtime.GOOS == "windows" && runtime.GOARCH == "arm64" {
-		t.Skipf("skipping due to suspected file corruption bug on windows/arm64 (https://go.dev/issue/50706)")
-	}
-
 	testenv.NeedsTool(t, "go")
 
 	gopath, err := filepath.Abs("testdata")