chore(scrollable-video): update Makefile

This patch removes --host and --port assignments on
`make dev-server` command since `host` and `port` are already
specified in `dev/webpack.config.js`.

packages/scrollable-video/makefile

@@ -12,7 +12,7 @@ dev-build-code:
 
 dev-server:
 	@echo "$(P) Start webpack dev server"
-	NODE_ENV=development $(ROOT_BIN_DIR)/webpack-dev-server --config dev/webpack.config.js --host $(DEV_HOST) --port ${DEV_PORT}
+	NODE_ENV=development $(ROOT_BIN_DIR)/webpack-dev-server --config dev/webpack.config.js 
 
 dev-validate:
 	NODE_ENV=production $(ROOT_DIR)/node_modules/.bin/babel-node --root-mode upward "./dev/validate.js"
@@ -25,4 +25,4 @@ clean:
 	@echo "$(P) Clean lib/"
 	$(ROOT_BIN_DIR)/rimraf lib dist
 
-.PHONY: build clean dev-server dev-build-code dev-fetch-data
+.PHONY: build clean dev-server dev-build-code dev-fetch-data