Ensure that the title stays on top (bnc#868859).

The bug says that most dialogs will move the title to the left for the
installation. This change forces the old layout here.
refactored the first_run condition
version + changelog
Really test for firstboot (gh#yast/yast-country#36)
Merge branch 'master' into title-top
Open a normal NextBack dialog.

With a proper API, a Steps hack is unnecessary.
Merge pull request #35 from yast/title-top

Ensure that the title stays on top durung the installation (bnc#868859).