Fix Rebase Dialog Upstream ComboBox had wrong initial tooltip

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Adjust checkbox and radio control widths to required size

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Right align numbers

Signed-off-by: Sven Strickroth <email@cs-ware.de>