Bug 32495: (follow-up) Remove required property

Bug 32495: (follow-up) Remove required property

This follow-up removes the required property from the text area as this
was missed previously.

Test plan:
1) In the ERM module, add a new agreement and observe that the Description field is required
2) Apply patch
3) Repeat step 1 but this time the Required flag will not be visible.
4) Submit the form with the Description field blank - the submission
   should work

Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>