Remove non-existent account from permissions file

The account bvera does no longer exist on GitHub, so every time CLOWarden tries to set its permissions, an error is raised.

Signed-off-by: Cintia Sanchez Garcia <[email protected]>

config.yaml

@@ -172,7 +172,6 @@ repositories:
       has_wiki: true
   - external_collaborators:
       Snergster: read
-      bvera: read
       denverwilliams: admin
       edwarnicke: write
       electrocucaracha: write