Fix 3815 Don't use default for moment in invoice

[zenweasel]

Resolves #3815
Impact: critical
Type: bugfix

Issue

moment was coming up undefined because we were looking for moment.default

Solution

Just use the root moment object returned by the import

Breaking changes

None

Testing

1. Add a product to cart and complete an order
2. Approve and Capture the order
3. Click on "Print Invoice"
4. Observe that the date is shown and there is no error in the console

[spencern]

👍 Resolved the client errors and correctly displays the date on the invoice.