refactor(AutoPruneHelperRoutine): improve debug msg

Author: christolis

application/src/main/java/org/togetherjava/tjbot/features/help/AutoPruneHelperRoutine.java

@@ -163,8 +163,9 @@ private void pruneMemberFromRole(Member member, Role role, ForumChannel helpForu
         guild.removeRoleFromMember(member, role)
             .flatMap(any -> member.getUser().openPrivateChannel())
             .flatMap(channel -> channel.sendMessage(dmMessage))
-            .queue(null,
-                    failure -> logger.debug("Tried to send a DM to a user but failed: ", failure));
+            .queue(null, failure -> logger
+                .debug("Failed sending a DM to user (%s) while pruning them from a helper role."
+                    .formatted(member.getId()), failure));
     }
 
     private void warnModsAbout(String message, Guild guild) {