fix(es_extended/client): stop stacking adjustment threads on every relog

Adjustments:Load() runs from the esx:playerLoaded handler, so it runs again on
every character switch. AmmoAndVehicleRewards, Multipliers and DiscordPresence
each start a `while true` thread that never exits, and SeatShuffle and
DisableRadio register another esx:enteredVehicle handler. Nothing tears any of it
down, so a player who switches characters a few times ends up with several
per-frame threads all writing the same values, and client performance degrades
until they reconnect.

The loops now run `while ESX.PlayerLoaded`, the same way StartServerSyncLoops and
Actions:SlowLoop already do, so they end on logout and a fresh one starts on the
next load. The two event handlers are registered once. Actions:Init already
documents this exact concern in a comment; Adjustments never got the same
treatment.

Measured in game on artifact 25770 by counting thread ticks per frame:
  before: 2.01 -> 3.01 -> 4.02 across two relogs
  after:  1.00 -> 1.00 -> 1.00

[core]/es_extended/client/modules/adjustments.lua

@@ -25,7 +25,9 @@ function Adjustments:DisableNPCDrops()
 end
 
 function Adjustments:SeatShuffle()
-    if Config.DisableVehicleSeatShuff then
+    if Config.DisableVehicleSeatShuff and not self.seatShuffleRegistered then
+        self.seatShuffleRegistered = true
+
         AddEventHandler("esx:enteredVehicle", function(vehicle, _, seat)
             if seat > -1 then
                 SetPedIntoVehicle(ESX.PlayerData.ped, vehicle, seat)
@@ -43,7 +45,7 @@ end
 
 function Adjustments:AmmoAndVehicleRewards()
     CreateThread(function()
-        while true do
+        while ESX.PlayerLoaded do
             if Config.DisableDisplayAmmo then
                 DisplayAmmoThisFrame(false)
             end
@@ -187,7 +189,7 @@ end
 function Adjustments:DiscordPresence()
     if Config.DiscordActivity.appId ~= 0 then
         CreateThread(function()
-            while true do
+            while ESX.PlayerLoaded do
                 SetDiscordAppId(Config.DiscordActivity.appId)
                 SetRichPresence(self:ReplacePlaceholders(Config.DiscordActivity.presence))
                 SetDiscordRichPresenceAsset(Config.DiscordActivity.assetName)
@@ -213,7 +215,9 @@ function Adjustments:WantedLevel()
 end
 
 function Adjustments:DisableRadio()
-    if Config.RemoveHudComponents[16] then
+    if Config.RemoveHudComponents[16] and not self.disableRadioRegistered then
+        self.disableRadioRegistered = true
+
         AddEventHandler("esx:enteredVehicle", function(vehicle, plate, seat, displayName, netId)
             SetVehRadioStation(vehicle,"OFF")
             SetUserRadioControlEnabled(false)
@@ -223,7 +227,7 @@ end
 
 function Adjustments:Multipliers()
     CreateThread(function()
-        while true do
+        while ESX.PlayerLoaded do
             SetPedDensityMultiplierThisFrame(Config.Multipliers.pedDensity)
             SetScenarioPedDensityMultiplierThisFrame(Config.Multipliers.scenarioPedDensityInterior, Config.Multipliers.scenarioPedDensityExterior)
             SetAmbientVehicleRangeMultiplierThisFrame(Config.Multipliers.ambientVehicleRange)