watchtower: uses P2TR for sweep, delivery, and reward addresses

In this commit, we modify the watch tower to use P2TR addrs for just
about anything sweep related.

One eye sore in this diff are the changes to
`backup_task_internal_test.go`. All the values are hard coded, and now
either differ by a value of 48, or needed to be modified to account for
the new assumptions propagated to rewards values and fees.

watchtower/wtclient/backup_task_internal_test.go

@@ -247,7 +247,7 @@ func genTaskTest(
 			RewardPkScript: rewardScript,
 		},
 		bindErr:        bindErr,
-		expSweepScript: makeAddrSlice(22),
+		expSweepScript: sweepAddr,
 		signer:         signer,
 		chanType:       chanType,
 	}
@@ -259,10 +259,18 @@ var (
 	blobTypeCommitReward = (blob.FlagCommitOutputs | blob.FlagReward).Type()
 
 	addr, _ = btcutil.DecodeAddress(
-		"mrX9vMRYLfVy1BnZbc5gZjuyaqH3ZW2ZHz", &chaincfg.TestNet3Params,
+		"tb1pw8gzj8clt3v5lxykpgacpju5n8xteskt7gxhmudu6pa70nwfhe6s3unsyk",
+		&chaincfg.TestNet3Params,
 	)
 
 	addrScript, _ = txscript.PayToAddrScript(addr)
+
+	sweepAddrScript, _ = btcutil.DecodeAddress(
+		"tb1qs3jyc9sf5kak3x0w99cav9u605aeu3t600xxx0",
+		&chaincfg.TestNet3Params,
+	)
+
+	sweepAddr, _ = txscript.PayToAddrScript(sweepAddrScript)
 )
 
 // TestBackupTaskBind tests the initialization and binding of a backupTask to a
@@ -297,9 +305,9 @@ func TestBackupTask(t *testing.T) {
 			expSweepCommitNoRewardBoth     int64                  = 299241
 			expSweepCommitNoRewardLocal    int64                  = 199514
 			expSweepCommitNoRewardRemote   int64                  = 99561
-			expSweepCommitRewardBoth       int64                  = 296117
-			expSweepCommitRewardLocal      int64                  = 197390
-			expSweepCommitRewardRemote     int64                  = 98437
+			expSweepCommitRewardBoth       int64                  = 296069
+			expSweepCommitRewardLocal      int64                  = 197342
+			expSweepCommitRewardRemote     int64                  = 98389
 			sweepFeeRateNoRewardRemoteDust chainfee.SatPerKWeight = 227500
 			sweepFeeRateRewardRemoteDust   chainfee.SatPerKWeight = 175350
 		)
@@ -307,9 +315,9 @@ func TestBackupTask(t *testing.T) {
 			expSweepCommitNoRewardBoth = 299236
 			expSweepCommitNoRewardLocal = 199513
 			expSweepCommitNoRewardRemote = 99557
-			expSweepCommitRewardBoth = 296112
-			expSweepCommitRewardLocal = 197389
-			expSweepCommitRewardRemote = 98433
+			expSweepCommitRewardBoth = 296064
+			expSweepCommitRewardLocal = 197341
+			expSweepCommitRewardRemote = 98385
 			sweepFeeRateNoRewardRemoteDust = 225400
 			sweepFeeRateRewardRemoteDust = 174100
 		}
@@ -436,7 +444,7 @@ func TestBackupTask(t *testing.T) {
 				"commit reward, to-remote output only, creates dust",
 				1,                            // stateNum
 				0,                            // toLocalAmt
-				100000,                       // toRemoteAmt
+				108221,                       // toRemoteAmt
 				blobTypeCommitReward,         // blobType
 				sweepFeeRateRewardRemoteDust, // sweepFeeRate
 				addrScript,                   // rewardScript