Skip getting the post again when getting file metadata for a post (#9879)

api4/post.go

@@ -528,7 +528,7 @@ func getFileInfosForPost(c *Context, w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	infos, err := c.App.GetFileInfosForPost(c.Params.PostId, false)
+	infos, err := c.App.GetFileInfosForPostWithMigration(c.Params.PostId)
 	if err != nil {
 		c.Err = err
 		return