refactor CopyProject

* Orientation was set to portrait in a previous commit
* activeDialogId is not needed any more
* onCopyProject is refactored - no check for orientationchange needed
refactor MyProjectsActivityTest

* add missing testOrientationChange
* testDeleteSprite() was waiting for the wrong Activity right after
 entering MyProjectsActivity
Merge pull request #164 from Catrobat/RefactorProjectsListFragment

Some additional refactoring to Pull Request #160