Sue Devaney has revealed that she had no intentions of leaving Coronation Street prior to being handed a tragic young-onset dementia storyline for her alter ego Debbie Webster.The star, who first appeared on the cobbles for a year from 1984, returned to the role in 2019. She was reinstated as a permanent cast member the following year, and has since become one of the ITV soap's most beloved characters.It was recently revealed by co-star Jonathan…