[JRASERVER-26659] Group Custom Field Value in the "Create Issue" project permission allows any user to create issues on a given project

When using the Group Custom Field Value on the "Create Issue" project permission, any user in JIRA is able to create issues on the project.

Steps to reproduce:

Create a Group Picker custom field (Global Context) (Administration> Issue Fields > Custom Fields) - let's say Test Group Picket Custom Field
- OPTIONAL Set a default value for the custom field
Go to the Default permission scheme and Add to the "Create Issue" Permission the option Group Custom Field Value
Go to the Default permission scheme and Add to the "Create Issue" Permission the option Group and choose group jira-administrators
Create a user and add it only to the jira-users group.
Create a project and associate it to the Default permission scheme
Log in JIRA with the user you just created
The user will be able to create issues on the project you just created project.

- If you remove the Group Custom Field Value from the "Create Issue" permission, the user is no longer able to create issues on the project.

relates to

JRASERVER-30783 Unexpected behaviour in Create Issue Permission with User custom field

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