Fixing the path in gitlab-ci, they changed in production

.gitlab-ci.yml

@@ -2,8 +2,8 @@ before_script:
 
 job install:
   variables:
-    BASE_PATH: /srv/piphone/sip-backend/
-    VIRTUALENV: /srv/piphone/sip-backend/.sip-backend_env
+    BASE_PATH: /srv/piphone/backend/
+    VIRTUALENV: /srv/piphone/backend/backend_env
   script:
     - rsync -ruvC ./ ${BASE_PATH}
     - source ${VIRTUALENV}/bin/activate