enable JR: Add2Systemd is not defined

[Slava Fomin II]

To control the node/validator through the browser, you need to install an additional module: mytonctrl -> installer -> enable JR

[3/4] Add to startup
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'Add2Systemd' is not defined. Did you mean: 'add2systemd'?
EnableJsonRpc - Error

$ cat /etc/issue
Ubuntu 22.04.3 LTS

$ uname -a
Linux 6.2.0-1010-aws #10~22.04.1-Ubuntu SMP Wed Aug 16 18:00:32 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux