Update test after QUrl minor behaviour change

Update test after QUrl minor behaviour change

Changes required:
 - Uppercase the hex in percent-encodings
 - The tolerant decoder treats all % as broken if any one is broken
   (Input "%2B50%" is rendered now "%252B50%25", where previously it
   was "%2B50%25)

The extra test is just so we use QString first. If the test fails, we
get a nicer output from QtTest, instead of the hex dump it uses for
QByteArray.

Change-Id: I4c5cbfa3be962c648b50a69dc8bc3c4acc551e62
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>