Fix a Unit Test that was failing due to Wolfgangs' change to a resource text in the last trunk commit which he didn't to in the Unit Test, too.

The test that was failing was this:
            Assert.IsTrue(TVerificationHelper.AreVerificationResultsIdentical(tester.Properties.DateVerificationResult,
                    Ict.Common.Verification.TDateChecks.GetInvalidDateVerificationResult("Date", null), false, false));

in \trunk\csharp\ICT\Testing\lib\Common\Controls\txtPetraDate.cs.