[CE-652]Fix the path error in the Makefile
The makefile contains the old path to the dashboard Dockerfile.
This patch fixed that error.
@@ -136,7 +136,7 @@ build/docker/%/.push: build/docker/%/$(DUMMY)
docker: $(patsubst %,build/docker/%/$(DUMMY),$(DOCKER_IMAGES)) ##@Generate docker images locally
-docker-operator-dashboard: build/docker/operator-dashboard/$(DUMMY)
+docker-operator-dashboard: build/docker/dashboard/$(DUMMY)
docker-clean: stop image-clean ##@Clean all existing images
