syncDNSFilters reconciles the Robert DNS filters on the server with the desired state derived from dnsConfig (a csv of presets such as "family,privacy"). It fetches the current filter states once, then issues one PUT per filter that needs to change. The call is a no-op when dnsConfig is empty.
(h *http.Client, ent *WsEntitlement, sess *WsSession, dnsConfig string, force bool)
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