[Bug] severity change when create new case don't work

[pdux]

Request Type

Bug

Work Environment

Question	Answer
OS version (server)	Oracle Linux Server 7.7
OS version (client)	W10
TheHive version / git hash	4 RC2
Package Type	RPM
Browser type & version	Chrome

Problem Description

When creating new case, I'm changing the severity from M to H, then save the case, the saved case has severity M

Steps to Reproduce

1. create new case
2. change severity to H
3. save case
4. check severity - M

If you change the severity when the case is already created all is ok.

[To-om]

This bug appears only if you apply a case template.