fix get file metadata bug (#5394)

* Removed problematic if statement

This if statement was causing the value of option.AllowedOrigins to be always equal to "*". Now the values in the config file will be used when present. This allows for people who don't need this feature to not update their security.toml files.

* Update filer_server_handers_read.go

* Updated filer responses to invalid requests

weed/server/filer_server_handlers_read_dir.go

@@ -2,6 +2,7 @@ package weed_server
 
 import (
 	"context"
+	"errors"
 	"net/http"
 	"strconv"
 	"strings"
@@ -12,14 +13,14 @@ import (
 	"github.com/seaweedfs/seaweedfs/weed/util"
 )
 
-// listDirectoryHandler lists directories and folers under a directory
+// listDirectoryHandler lists directories and folders under a directory
 // files are sorted by name and paginated via "lastFileName" and "limit".
 // sub directories are listed on the first page, when "lastFileName"
 // is empty.
 func (fs *FilerServer) listDirectoryHandler(w http.ResponseWriter, r *http.Request) {
 
 	if fs.option.ExposeDirectoryData == false {
-		http.NotFound(w, r)
+		writeJsonError(w, r, http.StatusForbidden, errors.New("ui is disabled"))
 		return
 	}