Update rbac_role_binding.yaml (#2112)

Bug fix: Added required field namespace for global mode

Author: geoffreytran

charts/fdb-operator/templates/rbac/rbac_role_binding.yaml

@@ -38,4 +38,7 @@ roleRef:
 subjects:
 - kind: ServiceAccount
   name: {{ include "fdb-operator.serviceAccountName" . }}
+  {{- if .Values.globalMode.enabled }}
+  namespace: {{ .Release.Namespace }}
+  {{- end }}
 {{- end }}