cleanup unused code and mixins

src/main/java/carpet/mixins/SpawnHelperInnerMixin.java

@@ -14,8 +14,6 @@ import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
 
-// temporary mixin until naming for spawnhelper gets fixed.
-
 @Mixin(SpawnHelper.Info.class)
 public class SpawnHelperInnerMixin implements SpawnHelperInnerInterface
 {