qt: Modernize code: Use in-class initializers for all members
* qt/pinentrydialog.h (class PinEntryDialog): Use in-class initializers for all POD members. * qt/pinentrydialog.cpp (PinEntryDialog::PinEntryDialog): Remove superfluous member initializers. Flag argument 'name' as unused. Remove superfluous initialization by assignment of _timed_out and _timer.