lncfg: add protocol config option for script enforced lease support

sample-lnd.conf

@@ -1101,6 +1101,12 @@ litecoin.node=ltcd
 ; (Deprecates the previous "protocol.anchors" setting.)
 ; protocol.no-anchors=true
 
+; Set to disable support for script enforced lease channel commitments. If not
+; set, lnd will accept these channels by default if the remote channel party
+; proposes them. Note that lnd will require 1 UTXO to be reserved for this
+; channel type if it is enabled.
+; protocol.no-script-enforced-lease=true
+
 
 [db]