Fix event action names that kept a / accidentally
Fix event action names that kept a / accidentally

fzzzy/pageshot,mozilla-services/pageshot,fzzzy/pageshot,fzzzy/pageshot,fzzzy/pageshot,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/pageshot