Fix typo leftover from local testing

main.go

@@ -192,7 +192,7 @@ func main() {
 					completionTime := time.Unix(part.GotStarAt, 0).In(ChicagoTimeZone).Format("3:04:05pm")
 					rank := getCompletionRank(&leaderboard, &member, dayIdx, partNum) + 1
 					ordinal := getOrdinal(rank)
-					overallRank := getLeaderboardRank(&lastLeaderboard, &member) + 1
+					overallRank := getLeaderboardRank(&leaderboard, &member) + 1
 					err := sendNotification(fmt.Sprintf(
 						":tada: %s completed day %d part %d %d%s on [the leaderboard](https://adventofcode.com/%s/leaderboard/private/view/%s) at %s, and now has %d star%s on the year, good for %d%s place overall. :tada:",
 						member.Name,