cmd/tarocli: fix help fall through for assets send

Before this commit, if you didn't provide the correct args, nothing
would print out since it was trying to print the help for the `sent`
command. We fix this to instead properly try to print the help for the
`send` command instead.

cmd/tarocli/assets.go

@@ -224,7 +224,7 @@ func sendAssets(ctx *cli.Context) error {
 
 	switch {
 	case ctx.String(addrName) == "":
-		_ = cli.ShowCommandHelp(ctx, "sent")
+		_ = cli.ShowCommandHelp(ctx, "send")
 		return nil
 	}