Tweak build settings
Tweak build settings

- Specify iphoneos for "Base SDK" on Nimble-iOSTests as well as Nimble-iOS target
- Remove i386 from "Valid Architectures" on Nimble-macOSTests as well as Nimble-macOS target

phatblat/Nimble,Quick/Nimble,phatblat/Nimble,AnthonyMDev/Nimble,Quick/Nimble,AnthonyMDev/Nimble,AnthonyMDev/Nimble,Quick/Nimble,phatblat/Nimble