remove user mapping from dockerized test command to avoid permission error

Author: angelo-v

Makefile

@@ -1,6 +1,5 @@
 test:
 	docker run --rm -t \
-		-u "$(shell id -u):$(shell id -g)" \
 		-v $(shell pwd):/project \
 		-v /var/run/docker.sock:/var/run/docker.sock:ro \
 		aveltens/docker-testinfra