fluentbit: do not install scripts CM if no logs are collected

The CM is only used on fluentbit-logs/daemonset.yaml which is
conditional to the same variables.

templates/fluentbit-logs/scripts.yaml

+{{- if and .Values.logs.enabled .Values.logs.fluentbit.enabled -}}
 apiVersion: v1
 kind: ConfigMap
 metadata:
@@ -11,3 +12,4 @@ data:
       record['timestamp'] = exp_sec * 1000
       return 2, timestamp, record
     end
+{{- end -}}