fix 'Save and submit for approval' bug
fix 'Save and submit for approval' bug

when user logins in with uppercase letters in email address, the
email address stored by florence doesn't match the one returned by
zebedee. this prevents string comparisons (e.g. in isPageCompleted)
from working


Former-commit-id: fa378e0e4e925c9c4126f993970dbc559f729da1
Former-commit-id: 58f36d7a5ec16bb323a6bb20e5093e20d433983a
Former-commit-id: 4b87b5c25f42ed7ff62372766a3cd6417d2878bc
ONSdigital/florence,ONSdigital/florence,ONSdigital/florence,ONSdigital/florence