fix for ProjectUpAndDownloadTest

also done some refactoring on StatusbarNotificationManager.java

Jenkins Testrun before rebasing with master and squashing together:
https://jenkins.catrob.at/job/Catroid-Multi-Job-Custom-Branch/194/

single UI test after refactoring:
https://jenkins.catrob.at/view/Catroid/job/Catroid-single-UI-device/28/