change regex to match new format of admin create command

bin/nexusbot.dart

@@ -77,7 +77,7 @@ void main(List<String> argsRaw) async {
         case EventTypes.Message:
           if (!event.senderId.startsWith("@${settings.adminName}:")) break;
           final results = RegExp(
-            r"@(?<username>[a-zA-Z0-9._-]+):[^\s]+.*?password:\s+`(?<password>[^`]+)`",
+            r"@(?<username>[a-zA-Z0-9._-]+):[^\s]+.*?password\s+`(?<password>[^`]+)`",
           ).firstMatch(event.body);
           if (results == null) return;