Fix: Removed double conversion of limit_groups

[kalisp]

Changelog Description

limit_groups settings got transformed twice. Kept nicer looking conversion.

Testing notes:

1. Set something to ayon+settings://deadline/publish/NukeSubmitDeadline/limit_groups (Limit Groups)
   

2. try to open Launcher on some project

3. it shouldn't throw

    item["name"]: item["value"] for item in nuke_submit.pop("limit_groups")
TypeError: string indices must be integers

and show DCCs