[Build] update target files for xcodegen 2.44

[NicolasBuquet]

Xcodegen 2.44 introduced a more rigorous YAML check : yonaskolb/XcodeGen#1547

settings:
  configs:
    Debug:
    Release:
      PROPERTY_NAME: <value>

Empty configs entry no failed generating Xcode project.

The solution is to remove empty Debug entry.