FIX: Submission for needs help sets submission date
FIX: Submission for needs help sets submission date

Submission date is now set when the task files are uploaded.
Works for needs help and ready to mark.

doubtfire-lms/doubtfire-api,doubtfire-lms/doubtfire-api,alexcu/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,final-year-project/doubtfire-api,doubtfire-lms/doubtfire-api,final-year-project/doubtfire-api,doubtfire-lms/doubtfire-api,alexcu/doubtfire-api,alexcu/doubtfire-api,alexcu/doubtfire-api,final-year-project/doubtfire-api,alexcu/doubtfire-api,jakerenzella/doubtfire-api,doubtfire-lms/doubtfire-api,final-year-project/doubtfire-api,jakerenzella/doubtfire-api,final-year-project/doubtfire-api,doubtfire-lms/doubtfire-api,jakerenzella/doubtfire-api,alexcu/doubtfire-api,jakerenzella/doubtfire-api,jakerenzella/doubtfire-api,jakerenzella/doubtfire-api