gluon-core: don't use DNS from cellular

Don't use the DNS server received from the cellular provider. The
provider DNS server shall only be used for the WAN dnsmasq resolver
instance.

Signed-off-by: David Bauer <mail@david-bauer.net>

package/gluon-core/luasrc/lib/gluon/upgrade/250-cellular

@@ -27,6 +27,7 @@ local function setup_ncm_qmi(devpath, control_type, delay)
 		device = devpath,
 		disabled = not uci:get_bool('gluon', 'cellular', 'enabled'),
 		pdptype = pdptype,
+		peerdns = false,
 		apn = uci:get('gluon', 'cellular', 'apn'),
 	})