DebugTranslationService: Do not show a window in the test

The test works fine with the window hidden. Trying to show it gives
problems in the CI. We also want to avoid showing windows in non-GUI
tests as far as possible.

Fixes: QTBUG-101738
Pick-to: 6.2 6.3
Change-Id: I206f74f940e6ba7ac6346c85459b896387ab85a5
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

tests/auto/qml/debugger/qqmldebugtranslationservice/tst_qqmldebugtranslationservice.cpp

@@ -72,8 +72,6 @@ private slots:
 
         m_view.setSource((testFileUrl(QMLFILE)));
         QTRY_VERIFY2(m_view.status() == QQuickView::Ready, "Failed to load QML file");
-        m_view.show();
-        QVERIFY(QTest::qWaitForWindowActive(&m_view));
         initQtHooks();
         QVERIFY(hooks->qt_qmlDebugEnableService(qPrintable(QQmlDebugTranslationServiceImpl::s_key)));
     }