Fix signing of api calls when in a non-instanced admin.

The secret key is set in SiteBotrMediaToaster::setSecret() and should be used from the internal secret property, not from the application. This occurancance of secret was just missed when those changes took place in 6d7e5b73
coding standards
Merge pull request #20 from isaacgrant/fix-toaster-secret

Fix BOTR api calls in non-instanced admins