fix some format string mismatches

activity.go

@@ -1235,7 +1235,7 @@ func collectiveaction(honk *Honk) {
 		j["id"] = user.URL + "/add/" + shortxid(ont+honk.XID)
 		j["actor"] = user.URL
 		j["object"] = honk.XID
-		j["target"] = fmt.Sprintf("https://%s/o/%s", ont[1:])
+		j["target"] = fmt.Sprintf("https://%s/o/%s", serverName, ont[1:])
 		rcpts := make(map[string]bool)
 		for _, dub := range dubs {
 			var box *Box

web.go

@@ -506,7 +506,7 @@ func serverinbox(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 		ont := "#" + m[1]
-		log.Printf("updating honker undo: %s", who, ont)
+		log.Printf("updating honker undo: %s %s", who, ont)
 		_, err = stmtUpdateFlavor.Exec("undub", user.ID, who, ont, "dub")
 		if err != nil {
 			log.Printf("error updating honker: %s", err)