[WebUI] Remove redundant condition

as "success" function is called only when .status is true

interface/js/app/upload.js

@@ -52,9 +52,7 @@ define(["jquery"],
                 headers: headers,
                 success: function (json) {
                     cleanTextUpload(source);
-                    if (json[0].status === true) {
-                        rspamd.alertMessage("alert-success", "Data successfully uploaded");
-                    }
+                    rspamd.alertMessage("alert-success", "Data successfully uploaded");
                 }
             });
         }