Remove bogus -D argument

Author: mhjacks

spec/acceptance/alternative_pgdata_spec.rb

@@ -13,7 +13,7 @@ class { 'postgresql::server': data_directory => '/var/pgsql' }
   end
 
   it 'can connect with psql' do
-    psql('-D /var/pgsql --command="\l" postgres', 'postgres') do |r|
+    psql('--command="\l" postgres', 'postgres') do |r|
       expect(r.stdout).to match(/List of databases/)
     end
   end