Add missing increment of blacklisted tests for BXFAIL case

The counter is just how many tests were blacklisted, regardless of
their success or otherwise.  Skipping its increment for BXFAIL is apt
to introduce noise in our tracking of how many tests are blacklisted.

Change-Id: I1dd74e5f6619121c21d8741be7bc4e2d1cb43fa9
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/testlib/qtestlog.cpp

@@ -470,6 +470,8 @@ void QTestLog::addBXFail(const char *msg, const char *file, int line)
     QTEST_ASSERT(msg);
     QTEST_ASSERT(file);
 
+    ++QTest::blacklists;
+
     QTest::TestLoggers::addIncident(QAbstractTestLogger::BlacklistedXFail, msg, file, line);
 }