package/qt5quickcontrols2: fix project URL
https://doc.qt.io/qt-5/qtquickcontrols2-index.html is re-directed to
https://doc.qt.io/qt-5/qtquickcontrols-index.html so use it directly
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 83bf1790c13a6a6ba4e4008f685d7b824ed15079)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>