To increase the effective test coverage, this patch
re-enables the tst_qprinter test case as such, and
instead disables only the test functions that are currently
failing in CI.
Task-number: QTBUG-22453
Change-Id: I74cc30dc26b8b83852b3516f8def995eab19cf0f
Reviewed-by: Jason McDonald <jason.mcdonald@nokia.com>