[lockscreen] Select wrong lockscreen password later

Selects the wrong lockscreen password just after the gracelock
timer is expired, and not earlier, when the user can't even
type.

REVIEW: 123991

lookandfeel/contents/lockscreen/LockScreen.qml

@@ -47,7 +47,6 @@ Image {
         target: authenticator
         onFailed: {
             root.notification = i18nd("plasma_lookandfeel_org.kde.lookandfeel","Unlocking failed");
-            root.clearPassword()
         }
         onGraceLockedChanged: {
             if (!authenticator.graceLocked) {