fix hack/db script

was foolish and failed to test this before, and then
we further added a db password

Signed-off-by: Jamie Klassen <cklassen@pivotal.io>

hack/db

@@ -1,7 +1,7 @@
 #!/bin/bash
 
-if command -qs pgcli; then
-  pgcli -h localhost -p 6543 -U dev concourse
+if which pgcli >/dev/null; then
+  PGPASSWORD=dev pgcli -h localhost -p 6543 -U dev concourse
 else
-  psql -h localhost -p 6543 -U dev concourse
+  PGPASSWORD=dev psql -h localhost -p 6543 -U dev concourse
 fi