input/size: remove unused constants

Since we never attempt to sweep an HTLC we offered with the preimage on
the remote's commitment, we never use the constant
AcceptedHtlcSuccessWitnessSize for weight estimation. Similarly, we
never timout an HTLC offered by the remote on our own commitment, and
don't need the constant OfferedHtlcTimeoutWitnessSize.

input/size.go

@@ -260,19 +260,6 @@ const (
 	//      - witness_script: (accepted_htlc_script)
 	AcceptedHtlcTimeoutWitnessSize = 1 + 1 + 73 + 1 + 1 + AcceptedHtlcScriptSize
 
-	// AcceptedHtlcSuccessWitnessSize 322 bytes
-	//      - number_of_witness_elements: 1 byte
-	//      - nil_length: 1 byte
-	//      - sig_alice_length: 1 byte
-	//      - sig_alice: 73 bytes
-	//      - sig_bob_length: 1 byte
-	//      - sig_bob: 73 bytes
-	//      - preimage_length: 1 byte
-	//      - preimage: 32 bytes
-	//      - witness_script_length: 1 byte
-	//      - witness_script (accepted_htlc_script)
-	AcceptedHtlcSuccessWitnessSize = 1 + 1 + 73 + 1 + 73 + 1 + 32 + 1 + AcceptedHtlcScriptSize
-
 	// AcceptedHtlcPenaltyWitnessSize 249 bytes
 	//      - number_of_witness_elements: 1 byte
 	//      - revocation_sig_length: 1 byte
@@ -317,18 +304,6 @@ const (
 	//      - OP_ENDIF: 1 byte
 	OfferedHtlcScriptSize = 3*1 + 20 + 5*1 + 33 + 10*1 + 33 + 5*1 + 20 + 4*1
 
-	// OfferedHtlcTimeoutWitnessSize 285 bytes
-	//      - number_of_witness_elements: 1 byte
-	//      - nil_length: 1 byte
-	//      - sig_alice_length: 1 byte
-	//      - sig_alice: 73 bytes
-	//      - sig_bob_length: 1 byte
-	//      - sig_bob: 73 bytes
-	//      - nil_length: 1 byte
-	//      - witness_script_length: 1 byte
-	//      - witness_script (offered_htlc_script)
-	OfferedHtlcTimeoutWitnessSize = 1 + 1 + 1 + 73 + 1 + 73 + 1 + 1 + OfferedHtlcScriptSize
-
 	// OfferedHtlcSuccessWitnessSize 317 bytes
 	//      - number_of_witness_elements: 1 byte
 	//      - nil_length: 1 byte