fix: addAccountToGroup

[kieckhafer]

Impact: minor
Type: bugfix

Issue

accounts were only getting added to one group when creating an account, instead of being added to all groups they should have been added to. i.e. the initial user should be added to the accounts-manager and system-manager groups when created, but was only being added to accounts-manager and therefore no shop could be created.

Solution

Update the addAccountToGroup function to run synchronously as to not overwrite the other data being run at the same time.

Breaking changes

None

Testing

1. Start a new app instance (clean database)
2. create an initial user
3. Create a shop. Doing this should prove the user is in both groups.
4. Open a mongodb viewer and see your accounts.groups array has both groups.

[aldeed]

Approve code only, didn't test

[manueldelreal]