test: fixed usage of QEXPECT_FAIL in tst_qglyphrun::initTestCase

test: fixed usage of QEXPECT_FAIL in tst_qglyphrun::initTestCase

The rest of this test gives unpredictable results if initTestCase fails.

Normally, a failure in initTestCase skips the rest of the test, but this
is not the case if QEXPECT_FAIL is used.  Adjust the test to ensure the
rest of it is still correctly skipped.

Change-Id: I8ba76161e788f10801029ef10693e9ac275a2897
Reviewed-on: http://codereview.qt.nokia.com/2713
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Kalle Lehtonen <kalle.ju.lehtonen@nokia.com>