Using a dark theme with the simplified offline style in Qt Assistant
results in hard to see links against a dark background. Let the
backend style the hyperlinks instead.
Fixes: QTBUG-32778
Change-Id: I51ca87f8a526a07a385e42a3c978712ac4d1e91b
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
(cherry picked from commit 6ab1f926504e7e4ad64e439f1bb0f7c0f4d3ba01)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
78d71d156b