Don't reverse order of files opened from the command line

Summary:
When you do kate file1 file2 file3, it will open tabs
in same order, file1 file2 file3.
In case of having kate opened, invoking it again with
kate file4 file5 file6 final result on tabs shall be
file4 file5 file6 file1 file2 file3
BUG: 397913

Reviewers: cullmann

Reviewed By: cullmann

Subscribers: zetazeta, cullmann, brauch, kwrite-devel

Tags: #kate

Differential Revision: https://phabricator.kde.org/D17145