Make xcodebuild the last build step

This way, once we've built dupeGuru using "make" a first time, we can
work on XCode stuff and build from XCode directly without having to go
through the whole build again.

run.py

@@ -4,7 +4,7 @@ import sys
 import os
 
 def main():
-    return os.system('open "build/dupeGuru.app"')
+    return os.system('open "build/Release/dupeGuru.app"')
 
 if __name__ == '__main__':
     sys.exit(main())