chinadns-ng: Fix typo

chinadns-ng/Makefile

@@ -88,6 +88,7 @@ endef
 
 define Package/chinadns-ng/install
 	$(INSTALL_DIR) $(1)/usr/bin
-	$(INSTALL_BIN) $(PKG_BUILD_DIR)/chinadns-ng $(1)/usr/bin
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/$(PKG_NAME) $(1)/usr/bin/chinadns-ng
+endef
 
 $(eval $(call BuildPackage,chinadns-ng))