actually set kaboutdata as application aboutdata

Summary:
otherwise kcrash won't be able to determine the bugaddress and without
bugaddress the drkonqi catching drkonqi won't know what to do with the
crash.

it ought to be noted that drkonqi will not allow reporting bugs against
drkonqi (not that I fully agree with the rationale)

BUG: 383842
FIXED-IN: 5.16.1

Test Plan:
- killall -SEGV dolphin
- open drkonqi
- killall -SEGV drkonqi
- open drkonqi
- offers instructions on how to proceed reporting a bug against drkonqi

Reviewers: #plasma, davidedmundson

Reviewed By: #plasma, davidedmundson

Subscribers: kossebau, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D21799