fix: safely handle duplicate entries when punishing alts

[confuser]

Reported on Discord:

[<t:1724562463:T> INFO] player1 lost connection: Disconnected
[<t:1724562463:T> INFO] Warning: player1 has the same IP as the following players:
player2
[<t:1724562463:T> WARN] java.sql.SQLException: Unable to run insert stmt on object me.confuser.banmanager.common.data.PlayerBanData@59b3f364: INSERT INTO `bm_player_bans` (`player_id` ,`reason` ,`actor_id` ,`created` ,`updated` ,`expires` ,`silent` ) VALUES (?,?,?,?,?,?,?)
[<t:1724562463:T> WARN] at BanManagerBukkit.jar//me.confuser.banmanager.common.ormlite.misc.SqlExceptionUtil.create(SqlExceptionUtil.java:25)
[<t:1724562463:T> WARN] at BanManagerBukkit.jar//me.confuser.banmanager.common.ormlite.stmt.mapped.MappedCreate.insert(MappedCreate.java:138)
[<t:1724562463:T> WARN] at BanManagerBukkit.jar//me.confuser.banmanager.common.ormlite.stmt.StatementExecutor.create(StatementExecutor.java:458)
[<t:1724562463:T> WARN] at BanManagerBukkit.jar//me.confuser.banmanager.common.ormlite.dao.BaseDaoImpl.create(BaseDaoImpl.java:329)
[<t:1724562463:T> WARN] at BanManagerBukkit.jar//me.confuser.banmanager.common.storage.PlayerBanStorage.ban(PlayerBanStorage.java:206)
[<t:1724562463:T> WARN] at BanManagerBukkit.jar//me.confuser.banmanager.common.listeners.CommonJoinListener.punishAlts(CommonJoinListener.java:544)
[<t:1724562463:T> WARN] at BanManagerBukkit.jar//me.confuser.banmanager.common.listeners.CommonJoinListener.lambda$onPlayerLogin$1(CommonJoinListener.java:409)
[<t:1724562463:T> WARN] at org.bukkit.craftbukkit.v1_19_R2.scheduler.CraftTask.run(CraftTask.java:101)
[<t:1724562463:T> WARN] at org.bukkit.craftbukkit.v1_19_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57)
[<t:1724562463:T> WARN] at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22)
[<t:1724562463:T> WARN] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)

Issue is caused by punishAlts being triggered both on BungeeCord and Bukkit