testlib: Properly cleanup after caught exception

We were only doing half of what qCleanup was doing in the
exception case, and in an inconsistent order. There's no
reason not to just call qCleanup to align the behavior.

Change-Id: Ic4e63afb4733de5b01a79272cca8908fca3de762
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

src/testlib/qtestcase.cpp

@@ -1957,13 +1957,7 @@ int QTest::qRun()
             QTestResult::setCurrentTestFunction(nullptr);
         }
 
-        QTestLog::stopLogging();
-
-#if defined(Q_OS_MACOS)
-        IOPMAssertionRelease(macPowerSavingDisabled);
-#endif
-
-        currentTestObject = nullptr;
+        qCleanup();
 
         // Re-throw exception to make debugging easier
         throw;