Fix compilation for cw dev team

[mvandervelden]

Changed code signing settings such that it can be compiled/archived by members of the Catawiki Apple Development Program.

Instructions for compiling (as a member of the Apple Developer Program):

• Launch the Secretive.xcodeproj project in Xcode
• Select the Secretive Scheme
• Set Target device to "Any Mac (Apple Silicon, Intel)
• Select Product -> Archive

Then the resulting archive can be run locally.

Steps missing: Signing/Notarizing the app so it can be run on a different device.

Instructions for that:

• Once the archive is created, open the Archives window (Window -> Organizer, select Secretive (com.catawiki.Secretive.SecretAgent)
• Select the (most recent) archive
• Select "Distribute App" -> "Developer ID" -> Upload or Export
• "Automatically Manage Signing"
• Then, on a properly configured device with the correct certificates and private keys in place, it should work.

Actual result:

[SteveLeviathan]

Can confirm it worked following the steps to archive and distribute.

Also was able to upload the build to Apple for Notarization: