format with gofumpt (#18184)

* gofumpt -w -l .

* gofumpt -w -l -extra .

* Add linter

* manual fix

* change make fmt

modules/setting/markup.go

@@ -123,7 +123,7 @@ func newMarkupRenderer(name string, sec *ini.Section) {
 	extensionReg := regexp.MustCompile(`\.\w`)
 
 	extensions := sec.Key("FILE_EXTENSIONS").Strings(",")
-	var exts = make([]string, 0, len(extensions))
+	exts := make([]string, 0, len(extensions))
 	for _, extension := range extensions {
 		if !extensionReg.MatchString(extension) {
 			log.Warn(sec.Name() + " file extension " + extension + " is invalid. Extension ignored")