[JENKINS:SECURITY-3064] Disabled permissions can be granted by `ssh2easy`

ssh2easy 1.4 and earlier does not verify that permissions configured to be granted are enabled.
This may allow users formerly granted (typically optional permissions, like Overall/Manage) to access functionality they're no longer entitled to.

NOTE: As a workaround, administrators can save the permission configuration after disabling a permission, as that will overwrite any permission assignments of disabled permissions.

The affected features have been removed without replacement in ssh2easy 1.6.