Don't `--focus` for dist-vercel

This breaks the vercel deploy as `--focus` will try to install
workspace dependency from the registry:

Reference:
https://github.com/yarnpkg/yarn/issues/5864
https://github.com/yarnpkg/yarn/issues/6715

ui/GNUmakefile

@@ -38,6 +38,5 @@ deps: clean
 dist-vercel: clean
 	mkdir -p dist/ui && \
 	cd packages/consul-ui && \
-		CONSUL_UI_INSTALL_FLAGS=--focus \
 		$(MAKE) build-staging && \
 		mv dist/* ../../dist/ui