itest: run FundPsbt test with imported account

This demonstrates that the "imported" account behaves differently for a
wallet that's watch-only vs. normal. The testTaprootImportTapscriptFullKeyFundPsbt
test case succeeds in a normal run but fails in a remote-signing setup.

For some reason, an imported tapscript address ends up in the "default"
account when remote-signing but in the "imported" account for a normal
wallet.

itest/lnd_remote_signer_test.go

@@ -27,6 +27,10 @@ var remoteSignerTestCases = []*lntest.TestCase{
 		Name:     "account import",
 		TestFunc: testRemoteSignerAccountImport,
 	},
+	{
+		Name:     "tapscript import",
+		TestFunc: testRemoteSignerTapscriptImport,
+	},
 	{
 		Name:     "channel open",
 		TestFunc: testRemoteSignerChannelOpen,
@@ -228,6 +232,24 @@ func testRemoteSignerAccountImport(ht *lntest.HarnessTest) {
 	tc.fn(ht, watchOnly, carol)
 }
 
+func testRemoteSignerTapscriptImport(ht *lntest.HarnessTest) {
+	tc := remoteSignerTestCase{
+		name:      "tapscript import",
+		sendCoins: true,
+		fn: func(tt *lntest.HarnessTest, wo, carol *node.HarnessNode) {
+			testTaprootImportTapscriptFullTree(ht, wo)
+			testTaprootImportTapscriptPartialReveal(ht, wo)
+			testTaprootImportTapscriptRootHashOnly(ht, wo)
+			testTaprootImportTapscriptFullKey(ht, wo)
+
+			testTaprootImportTapscriptFullKeyFundPsbt(ht, wo)
+		},
+	}
+
+	_, watchOnly, carol := prepareRemoteSignerTest(ht, tc)
+	tc.fn(ht, watchOnly, carol)
+}
+
 func testRemoteSignerChannelOpen(ht *lntest.HarnessTest) {
 	tc := remoteSignerTestCase{
 		name:      "basic channel open close",