fix rubocop offences

spec/ee/spec/lib/ee/gitlab/ldap/user_filter_spec.rb

@@ -28,7 +28,7 @@ describe EE::Gitlab::LDAP::UserFilter do
     it 'errors out with an invalid filter' do
       filter = ')('
 
-      expect{ described_class.filter(fake_proxy, filter) }.to raise_error(Net::LDAP::FilterSyntaxInvalidError, 'Invalid filter syntax.')
+      expect { described_class.filter(fake_proxy, filter) }.to raise_error(Net::LDAP::FilterSyntaxInvalidError, 'Invalid filter syntax.')
     end
   end
 end