Make tests independent of Setting["org_name"]

So tests won't fail when an institution changes the default organization
name.

The tests are also easier to understand now, since it's more obvious
where the "CONSUL" text is coming from.

spec/system/admin/system_emails_spec.rb

@@ -201,6 +201,7 @@ describe "System Emails" do
     end
 
     scenario "#user_invite" do
+      Setting["org_name"] = "CONSUL"
       visit admin_system_email_view_path("user_invite")
 
       expect(page).to have_content "Invitation to CONSUL"