style: gofumpt all the things (#9829)

Literally `gofumpt -w .` from the top level dir. Guaranteed to be minor
style changes only and nothing else.

@imsodin per request?

lib/versioner/empty_dir_tracker_test.go

@@ -27,7 +27,7 @@ import (
 //		└── remove21
 //		    └── remove22
 func TestEmptyDirs(t *testing.T) {
-	var paths = []struct {
+	paths := []struct {
 		path   string
 		isFile bool
 	}{
@@ -44,7 +44,7 @@ func TestEmptyDirs(t *testing.T) {
 		{"remove2/remove21/remove22", false},
 	}
 
-	var expected = []string{
+	expected := []string{
 		"remove2/remove21/remove22",
 		"remove2/remove21",
 		"remove2",