Fix for #2402 player record was deleted on quit

This was due to the changes to the Player cache. On quit the cache was
cleared, but this was also deleting the player from the database.

src/main/java/world/bentobox/bentobox/api/user/User.java

@@ -160,7 +160,6 @@ public class User implements MetaDataAble {
     public static void removePlayer(Player player) {
         if (player != null) {
             users.remove(player.getUniqueId());
-            BentoBox.getInstance().getPlayers().removePlayer(player);
         }
     }
 

src/test/java/world/bentobox/bentobox/api/user/UserTest.java

@@ -178,7 +178,6 @@ public class UserTest {
         // If the player has been removed from the cache, then code will ask server for player
         // Return null and check if instance is null will show that the player is not in the cache
         when(Bukkit.getPlayer(any(UUID.class))).thenReturn(null);
-        verify(pm).removePlayer(player);
     }
 
     @Test