`getEnvWithDefault.nix` prints a trace message in console when a default value is not set.
In this commit we add a check to see if default value matches the value of that env var.
Otherwise we get log messages like these when running `make run-ios`
```
trace: getEnvWithDefault IOS_STATUS_GO_TARGETS
(default: ios/arm64;iossimulator/amd64): ios/arm64;iossimulator/amd64
trace: getEnvWithDefault IOS_STATUS_GO_TARGETS
(default: ios/arm64;iossimulator/amd64): ios/arm64;iossimulator/amd64
```
We also fix a tiny mistake in `make run-ios` status-go target by updating the delimiter to be a semi-colon instead of a comma.