Fix bad quoting and enable vault ui in foreground example

Author: absltkaos

examples/foreground/DevlabConfig.json

@@ -11,7 +11,7 @@
             "enabled": true,
             "cmd": "vault server -config /vault/config",
             "run_opts": [
-                "-e","VAULT_LOCAL_CONFIG={\"backend\": {\"file\": {\"path\": \"/vault/file\"}}, \"disable_mlock\":true, \"listener\": {\"tcp\": {\"address\": \"0.0.0.0:8200\", \"tls_disable\":1}}"
+                "-e","VAULT_LOCAL_CONFIG={\"backend\": {\"file\": {\"path\": \"/vault/file\"}}, \"disable_mlock\":true, \"listener\": {\"tcp\": {\"address\": \"0.0.0.0:8200\", \"tls_disable\":1}}, \"ui\": true}"
             ],
             "ports": [
                 "8200:8200"