Fix UsersFinder#by_non_ldap

Signed-off-by: Rémy Coutable <remy@rymai.me>

app/finders/users_finder.rb

@@ -30,7 +30,7 @@ class UsersFinder
     users = by_active(users)
     users = by_external_identity(users)
     users = by_external(users)
-    users = by_ldap(users)
+    users = by_non_ldap(users)
 
     users
   end

spec/finders/users_finder_spec.rb

@@ -58,7 +58,7 @@ describe UsersFinder do
         it 'returns only non-ldap users with skip_ldap: true' do
           users = described_class.new(user, skip_ldap: true).execute
 
-          expect(users).not_to contain_exactly(user, user1, user2, omniauth_user)
+          expect(users).to contain_exactly(user, user1, user2, omniauth_user)
         end
       end
     end