R1:698ada2470b1

Correct overbroad automatic capability grant of global settings objects

Summary:
Ref T13679. In D16983, global settings objects were given an exception to let logged-out users see them, even on installs with no "public" user role.

This exception is too broad and grants everyone all capabilities, not just "CAN_VIEW". In particular, it incorrectly grants "CAN_EDIT", so any user can edit global settings defaults.

Restrict this grant to "CAN_VIEW".

Test Plan:
- As a non-administrator, tried to edit…