KF6: remove unnecessary back signal handler
this was necessary in kf5 when we had a different implementation of OverlaySheet component which couldn't intercept back button events.
Signed-off-by: Matej Starc matej.starc@protonmail.com
this was necessary in kf5 when we had a different implementation of OverlaySheet component which couldn't intercept back button events.
Signed-off-by: Matej Starc matej.starc@protonmail.com