restoring providers is not simple, removing todo

bukkit/src/main/java/us/myles/ViaVersion/bukkit/platform/BukkitViaLoader.java

@@ -116,7 +116,6 @@ public class BukkitViaLoader implements ViaPlatformLoader {
 
     @Override
     public void unload() {
-        // todo restore providers
         for (Listener listener : listeners) {
             HandlerList.unregisterAll(listener);
         }

sponge/src/main/java/us/myles/ViaVersion/sponge/platform/SpongeViaLoader.java

@@ -81,7 +81,6 @@ public class SpongeViaLoader implements ViaPlatformLoader {
     }
 
     public void unload() {
-        // todo restore providers
         listeners.forEach(Sponge.getEventManager()::unregisterListeners);
         listeners.clear();
         tasks.forEach(Via.getPlatform()::cancelTask);