all: Format code with gofumpt

See https://github.com/mvdan/gofumpt

tpl/internal/go_templates/testenv/testenv.go

@@ -13,7 +13,6 @@ package testenv
 import (
 	"errors"
 	"flag"
-	"github.com/gohugoio/hugo/tpl/internal/go_templates/cfg"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -22,6 +21,8 @@ import (
 	"strings"
 	"sync"
 	"testing"
+
+	"github.com/gohugoio/hugo/tpl/internal/go_templates/cfg"
 )
 
 // Builder reports the name of the builder running this test

tpl/internal/go_templates/testenv/testenv_windows.go

@@ -12,8 +12,10 @@ import (
 	"syscall"
 )
 
-var symlinkOnce sync.Once
-var winSymlinkErr error
+var (
+	symlinkOnce   sync.Once
+	winSymlinkErr error
+)
 
 func initWinHasSymlink() {
 	tmpdir, err := ioutil.TempDir("", "symtest")