Invalid QR dialog wrong button functions (EXPOSUREAPP-7341) (#3253)

* OSD back button does same thing as cancel button.

* Make solution isolated

* Fix linting

* Simplified condition.

* Cancel function now works consistently with all invalid QR codes.

* Renamed function.

Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: Alexander Alferov <a.alferov@sap.com>
Co-authored-by: Juraj Kusnier <jurajkusnier@users.noreply.github.com>
Co-authored-by: Mohamed Metwalli <mohamed.metwalli@sap.com>