Add option to have close button on each tab
Summary:
Per VDG, allow closable tabs to have close buttons;
this adds this option while leaving the previous options.
Reviewers: tcanabrava, VDG, Konsole, ngraham, hindenburg
Reviewed By: tcanabrava, VDG, Konsole, ngraham, hindenburg
Subscribers: aacid, rizzitello, abetts, ngraham, hindenburg, konsole-devel
Tags: Konsole
Differential Revision: https://phabricator.kde.org/D17814