Fixes #6808/BZ1124058: fixing permissions of product buttons.

Several product buttons were using the incorrect permission
in determining whether to disable the buttons.  This commit
fixes these incorrect permissions.

http://projects.theforeman.org/issues/6808
https://bugzilla.redhat.com/show_bug.cgi?id=1124058
This seems weird for API data and specific to the UI. Looking at the logic, seems like the UI could check this itself to determine where the product can or can't be removed.