Update secret names for the postgresql secret. (#6115)

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### Description of the change

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While using the normal Makefile target to setup a dev env, I noticed it
would fail because the postgresql db secret was missing the `password`
data field. Not sure if the chart updated recently to include validation
of the data even though we don't use it, but I've taken the opportunity
to remove the `postgres-postgres-password` entry (don't remember why we
ended up with that) and replace it with the missing `password` entry.

### Benefits

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Dev environment setup works.

### Possible drawbacks

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### Applicable issues

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- fixes #

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Signed-off-by: Michael Nelson <[email protected]>

script/makefiles/deploy-dev.mk

@@ -31,8 +31,8 @@ deploy-dependencies: deploy-dex deploy-openldap devel/localhost-cert.pem
 		--key ./devel/localhost-key.pem \
 		--cert ./devel/localhost-cert.pem
 	kubectl --kubeconfig=${CLUSTER_CONFIG} -n kubeapps create secret generic postgresql-db \
-		--from-literal=postgres-postgres-password=dev-only-fake-password \
-		--from-literal=postgres-password=dev-only-fake-password
+		--from-literal=postgres-password=dev-only-fake-password \
+		--from-literal=password=dev-only-fake-password
 
 deploy-dev-kubeapps:
 	helm --kubeconfig=${CLUSTER_CONFIG} upgrade --install kubeapps ./chart/kubeapps --namespace kubeapps --create-namespace \