Silence a single test that races kdeglobals

This is a known flaky test upstream.  There is a good RCA at
https://invent.kde.org/frameworks/kconfig/-/merge_requests/219 but the
long and the short of it is that the test is flaky as-is.
--- kconfig-5.116.0/autotests/kconfigtest.cpp.old	2024-05-04 06:38:05.000000000 -0500
+++ kconfig-5.116.0/autotests/kconfigtest.cpp	2025-06-30 04:04:40.523164120 -0500
@@ -1785,7 +1785,6 @@
         KConfig mainConfig(s_kconfig_test_subdir);
         KConfigGroup mainGroup(&mainConfig, "OwnTestGroup");
         QCOMPARE(mainGroup.readEntry("GlobalKey", "Default"), QStringLiteral("Default")); // key is gone
-        QCOMPARE(mainGroup.keyList(), expectedKeys);
     }
 }