fix(clean): remove invalid 'onlyif' statement from repo.clean

A dictionary is passed to the salt 'onlyif' condition. This is invalid syntax
and the condition is already checked by in the jinja around it.

docker/software/package/repo/clean.sls

@@ -10,7 +10,5 @@
 {{ formula }}-software-package-repo-absent:
   pkgrepo.absent:
     - name: {{ d.pkg.docker.repo.name }}
-    - onlyif:
-      - {{ d.pkg.docker.repo }}
 
     {%- endif %}