Deploy device not saved in Project Launcher

The deploy device selected in project launcher custom profile does not get saved. After restarting the editor, all selections are cleared, and have to be re-selected in the deploy device every time.

This issue does not happen in 5.3.

This issue happens after CL 27589933, and the direct cause is [Launcher.DeviceGroups] section not saved in [Project]\Saved\Config\WindowsEditor\Engine.ini .

Steps to Reproduce

• Start an empty project in UE 5.4
• Tools -> Project Launcher -> Add a new Custom Launch Profile
• Set "Cook" section to "By the book"
• In "Deploy" section, check any device

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• Click "Back", then Click "Edit" on the same profile again to confirm it is still checked.
• Restart Editor.
• Tools -> Project Launcher -> Edit the profile we created.
• Observe that none of the device is checked.

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