A user with a role with 'manage users' system permission does not see the settings menu #1110

Describe the bug
A user with a role with 'manage users' system permission does not see the 'settings' menu on the top bar. In order to see the bar the 'Manage app settings' system permission must also be included in the role.

Steps To Reproduce

1. Create a new role that includes the Manage Users system permission.
2. Assign the new role to a user
3. Login with this user and check the top bar. The Settings menu is missing.

Expected behavior
A user with the role should be able to access the Users sub menu of settings without having access to change the core app settings.

Your Configuration (please complete the following information):

• Exact BookStack Version (Found in settings): BookStack v0.24.1
• Hosting Method (Nginx/Apache/Docker): Ubuntu 18.04 - Using included installation script