Update v-change-sys-ip-nat (#4591)

Bypass vsftpd "OOPS: invalid pasv_address (500)."

bin/v-change-sys-ip-nat

@@ -90,7 +90,7 @@ if [ -n "$old" ] && [ -n "$FTP_SYSTEM" ]; then
 				sed -i "/pasv_address/d" "$ftp_conf"
 			fi
 			if [ -n "$check_pasv" ] && [ -n "$nat_ip" ]; then
-				sed -i "s/pasv_address=.*/pasv_address='$nat_ip'/g" "$ftp_conf"
+				sed -i "s/pasv_address=.*/pasv_address=$nat_ip/g" "$ftp_conf"
 			fi
 		fi
 	fi