Policy transparency dialog should be shown when SwitchBar is restricted.

After ag/3818911, touch event of Switchbar is delegated to the switch.
When the SwithBar is disabled by admin, switch is GONE and restricted icon
is VISIBLE instead. We should let touch event be delegaed to restricted
icon and show policy transparency dialog when it's clicked in this case.

Bug: 77898233
Bug: 70206452
Test: Manually via setting disallow_share_location in TestDPC.

Merged-In: Ifa4fa6ebbe7986277f5cd0951a399ea2377a39f9

Change-Id: If4a5349134e6f0e064561b4860966f950ce423b3