WT should inject GUIDs for guidless custom profiles

[dev-nicolaos]

Environment

Windows build number: 10.0.18362.0
Windows Terminal version: 0.5.2661.0

Steps to reproduce

1. Open WT
2. Open profiles.json
3. Create an object in the profiles array
4. Fill in some fields such as name, commandline, startingDirectory, colorScheme, etc.
5. Save profiles.json

Expected behavior

WT will generate/add a guid to the new custom profile, that way it can be set as the defaultProfile. This was the case in previous versions of WT, before separation of cascading settings was implemented.

Actual behavior

WT does not generate/add a guid to the new profile, thus there appears to be no way to set your custom profile as the default.

[DHowett-MSFT]

Curious. Thanks for the catch! For now, if you generate a guid and set it for that guid-less profile you can set that as a default.
Sorry for the miss.

[DHowett-MSFT]

This probably came about in 0.4 when we stopped writing folks' settings files back out to disk, honestly.

[DHowett-MSFT]

I've converted this into a task for injecting the GUID into the guidless profile. Thanks for reporting!