encapsulating isClientSide()

src/main/java/carpet/mixins/EntityMixin.java

@@ -35,6 +35,6 @@ public abstract class EntityMixin implements EntityInterface
     @Inject(method = "isLocalInstanceAuthoritative", at = @At("HEAD"), cancellable = true)
     private void isFakePlayer(CallbackInfoReturnable<Boolean> cir)
     {
-        if (getControllingPassenger() instanceof EntityPlayerMPFake) cir.setReturnValue(!level.isClientSide);
+        if (getControllingPassenger() instanceof EntityPlayerMPFake) cir.setReturnValue(!level.isClientSide());
     }
 }