Use vanilla whitelist as plugin failsafe

[Xitee1]

Summary

• Override PlayerLoginEvent.Result.KICK_WHITELIST in JoinQuitListener.onLogin so the plugin can let regular players in while it is active
• Acts as a defense-in-depth safety net: if the plugin is disabled or fails to load, no event handler runs, the vanilla whitelist enforces, and only whitelisted admins can connect — preventing unregulated access while the plugin's TrustLevel/permission system is offline

Setup required

• white-list=true in server.properties
• Only admins (incl. server owner) added via /whitelist add

Test plan

• Plugin enabled, whitelist on, non-whitelisted player → joins successfully
• Plugin enabled, whitelist on, whitelisted admin → joins successfully
• Plugin disabled, whitelist on, non-whitelisted player → kicked by vanilla whitelist
• Plugin disabled, whitelist on, whitelisted admin → joins successfully
• Banned player still kicked (KICK_BANNED) regardless of whitelist override
• Player with DB load failure still kicked (KICK_OTHER) regardless of whitelist override

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