fix appendChildNode() call

fix appendChildNode() call

Origin: upstream, https://code.qt.io/cgit/qt/qtlocation.git/commit/?id=6cb20a08b65c73b4
Last-Update: 2023-08-18

The QSGNode::appendChildNode() method checks that its parameter must
not have a parent. Before this patch we always called appendChildNode()
on a node that already had parent, which was always leading to ASSERT
in a debug build.

Seems that the right approach would be to call this method, if the
node *does not* have a parent.

Gbp-Pq: Name fix_appendChildNode_call.diff