Revert "Add missed UserInterfacePositioner.py"

This reverts commit 4387705aef91eebc4bd9374ddda9472ca2e520d8.
Revert "Add WizardUserInterfacePositioner - not activated yet in StartWizard.py"

This reverts commit 13b1353097619332c76b456f61efdf6ed57f3067.