fix(es_extended/server/main): skip unknown weapons when loading a loadout

ESX.GetWeaponLabel asserts on a name that is not in Config.Weapons, so it
never returns a falsy value and the `if label then` check below it can never
skip anything. The assert propagates out of loadESXPlayer, which means the
player object is never created and esx:playerLoaded never fires - the player
is stuck on the loading screen and hits the same error on every reconnect.

This happens whenever a saved loadout holds a weapon the config no longer
knows, for example after changing sv_enforceGameBuild or after removing a
weapon from shared/weapons.lua.

Wrapping the lookup keeps GetWeaponLabel itself untouched and lets the
existing check do what it was written for.

[core]/es_extended/server/main.lua

@@ -288,9 +288,9 @@ function loadESXPlayer(identifier, playerId, isNew)
 
             local loadout = json.decode(result.loadout)
             for name, weapon in pairs(loadout) do
-                local label = ESX.GetWeaponLabel(name)
+                local found, label = pcall(ESX.GetWeaponLabel, name)
 
-                if label then
+                if found and label then
                     userData.loadout[#userData.loadout + 1] = {
                         name = name,
                         ammo = weapon.ammo,