CueSettingSize.NoDelimiter -- Incorrect assertions, bad test data

Test data checks `size10%`, which would evaluate to the keyword `size` and the token `PERCENTAGE` with no `:` in between. That might be okay, but a more clear error here is probably `WEBVTT_INVALID_CUESETTING`, because `size10%` is not a valid keyword. So, the thing that will actually return a `WEBVTT_MISSING_CUESETTING_DELIMITER` error is inserting a space between those symbols, and it probably makes more sense this way too.

In addition, the assertions for this test are incorrect even considering the bad data. Comments are wrong as well.