PHRAS-4056 -fix non escaped path error in sed #986

Job	Run time
build phraseanet-db / build	31s
build phraseanet-elasticsearch / build	20s
build phraseanet-fpm / build	3m 40s
build phraseanet-nginx / build	2m 53s
build phraseanet-setup / build	3m 46s
build phraseanet-worker / build	3m 51s
unit test	5m 29s
	20m 30s

Provide feedback