Remove inappropriate QSKIP in QTextCodec autotest.

Remove inappropriate QSKIP in QTextCodec autotest.

There were only two ways the QSKIP could be called: (1) the C++ runtime
is broken, or (2) the earlier call to resize the string failed.

In both cases there should be a hard test failure. In the former case, a
broken C++ runtime calls all of the test results into question.  In the
latter case, the QByteArray::resize() method has suffered a regression.

Change-Id: I5adf942d2eb4d746d2ab31e98571c5d9bdd40890
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>