titaniumsdk: Build universal versions of debug apps

pkgs/development/mobile/titaniumenv/build-app.nix

···
             
             cp -av * $out
             cd $out
-            ${titaniumsdk}/mobilesdk/*/*/iphone/builder.py build 6.0 $(pwd) ${appId} "${name}"
+            ${titaniumsdk}/mobilesdk/*/*/iphone/builder.py build 6.0 $(pwd) ${appId} "${name}" universal
           ''
 
       else throw "Target: ${target} is not supported!"}