Fix thousands separator adding extra comma at the start

Affects the "___ notes placed" indicator in Discord Rich Presence.

Author: Bentroen

scripts/string_format_thousands/string_format_thousands.gml

@@ -4,10 +4,11 @@ function string_format_thousands(argument0) {
 	var input = string(argument0);
 	var str = "";
 	var count = 0;
-	if (string_length(input) > 3) {
-		for (var i = string_length(input); i > 0; i--) {
+	var length = string_length(input);
+	if (length > 3) {
+		for (var i = length; i > 0; i--) {
 			count++;
-			if (str != "" && count % 3 == 0) {
+			if (str != "" && count % 3 == 0 && count != length) {
 				str = "," + string_copy(input, i, 1) + str;
 			} else {
 				str = string_copy(input, i, 1) + str;