Fix CueSetting.DigitDelimiter unit test.

Update the test to expect what the parser returns. If we're treating
this as an invalid timestamp (which we should, because there's an
extra digit on the ms field) then the start of the timestamp makes
as much sense as the end.
Merge pull request #337 from rillian/csgeneric

Fix CueSetting.DigitDelimiter unit test.