add custom hashCode

Author: danthe1st

src/main/java/net/discordjug/javabot/systems/moderation/PurgeCommand.java

@@ -251,6 +251,9 @@ private void archiveMessage(PrintWriter writer, Message message) {
 	}
 
 	private record RunningPurge(long id, AtomicBoolean cancelled) {
-		
+		@Override
+		public final int hashCode() {
+			return (int) id;
+		}
 	}
 }