Correct CueSettingAlign.BadDelimiter test

Was asserting for error INVALID_CUESETTING_DELIMITER, however we've
decided that instead this should return WEBVTT_INVALID_CUESETTING as
"align;" is technically not a valid keyword. Also updated comments,
linewrapping, and ensure that errorCount == 1 before trying to get the
error.
Merge pull request #235 from caitp/align-bad-delimiter

Correct CueSettingAlign.BadDelimiter test