lntest+itest: rename AssertNumEdges to AssertNumActiveEdges

To properly reflect what the assertion is.

itest/lnd_open_channel_test.go

@@ -84,7 +84,7 @@ func testOpenChannelAfterReorg(ht *lntest.HarnessTest) {
 	ht.AssertTopologyChannelOpen(bob, chanPoint)
 
 	// Alice should now have 1 edge in her graph.
-	ht.AssertNumEdges(alice, 1, true)
+	ht.AssertNumActiveEdges(alice, 1, true)
 
 	// Now we disconnect Alice's chain backend from the original miner, and
 	// connect the two miners together. Since the temporary miner knows
@@ -112,7 +112,7 @@ func testOpenChannelAfterReorg(ht *lntest.HarnessTest) {
 
 	// Since the fundingtx was reorged out, Alice should now have no edges
 	// in her graph.
-	ht.AssertNumEdges(alice, 0, true)
+	ht.AssertNumActiveEdges(alice, 0, true)
 
 	// Cleanup by mining the funding tx again, then closing the channel.
 	block = ht.MineBlocksAndAssertNumTxes(1, 1)[0]