Fix invalid JSON (trailing comma) in operator-ui OPERATOR_UI_CONFIG (#3144)

The postgresql_versions array had a trailing comma after "14" in two places
that build OPERATOR_UI_CONFIG as JSON. OPERATOR_UI_CONFIG is parsed by the UI
with Python's json.loads() (operator_ui/main.py), which rejects trailing
commas, so the config fails to load:

  json.decoder.JSONDecodeError: Expecting value: line 25 column 3

Remove the trailing comma in:
- charts/postgres-operator-ui/templates/deployment.yaml (chart Deployment)
- ui/run_local.sh (local dev default_operator_ui_config)

ui/manifests/deployment.yaml and the Python DEFAULT_UI_CONFIG in
operator_ui/main.py were already correct.

Fixes #3062

charts/postgres-operator-ui/templates/deployment.yaml

@@ -88,7 +88,7 @@ spec:
                     "17",
                     "16",
                     "15",
-                    "14",
+                    "14"
                   ]
                 }
             {{- if .Values.extraEnvs }}