Correct prefix reported for end element in QXmlStreamReader

Before this change, QXmlStreamReader prefix value was always an empty
string for EndElement when the documentation state : "Returns the prefix
of a StartElement or EndElement."

The error was a missing update of the prefix value when parsing
EndElement.

I updated the tests data which were also wrong because no prefix were
reported even for </a:foo>. No new test is necessary, I think, the test
data already cover the cases of EndElement with a prefix and without one
(unchanged here).

Fixes: QTBUG-86847
Change-Id: I0ad38b9741d760f1ce688a36f969ec14e20a928c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 366bdcde97962cf5804c519e9b605eddb543a592)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

0 files changed, 0 insertions, 0 deletions