Don't wrap buffer tasks in scheduler calls

bukkit/src/main/java/me/lucko/luckperms/bukkit/LPBukkitPlugin.java

@@ -138,7 +138,7 @@ public class LPBukkitPlugin extends JavaPlugin implements LuckPermsPlugin {
         updateTaskBuffer = new BufferedRequest<Void>(1000L, this::doAsync) {
             @Override
             protected Void perform() {
-                doAsync(new UpdateTask(LPBukkitPlugin.this));
+                new UpdateTask(LPBukkitPlugin.this).run();
                 return null;
             }
         };

bungee/src/main/java/me/lucko/luckperms/bungee/LPBungeePlugin.java

@@ -114,7 +114,7 @@ public class LPBungeePlugin extends Plugin implements LuckPermsPlugin {
         updateTaskBuffer = new BufferedRequest<Void>(1000L, this::doAsync) {
             @Override
             protected Void perform() {
-                doAsync(new UpdateTask(LPBungeePlugin.this));
+                new UpdateTask(LPBungeePlugin.this).run();
                 return null;
             }
         };

sponge/src/main/java/me/lucko/luckperms/sponge/LPSpongePlugin.java

@@ -154,7 +154,7 @@ public class LPSpongePlugin implements LuckPermsPlugin {
         updateTaskBuffer = new BufferedRequest<Void>(1000L, this::doAsync) {
             @Override
             protected Void perform() {
-                doAsync(new UpdateTask(LPSpongePlugin.this));
+                new UpdateTask(LPSpongePlugin.this).run();
                 return null;
             }
         };