set default values in lego brick spinners and extended test

Set remaining default values for LegoBricks concerning issues #126 and #129.

Jenkins testruns:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-custom-branch-test/946/
(has nothing to do with web and MyProjectActivity-tests)

testModifyUserVariableValuesInStage:
http://catrobatgw.ist.tugraz.at:8080/job/Catroid-single-UI-test/641/