Bug 1273645: remove unnecessary scope from decision task; r=garndt

MozReview-Commit-ID: ViGVLPCXc6

--HG--
extra : rebase_source : d7c5910f9789f0e68b62fe4d1d5c06b9fdda1f76

.taskcluster.yml

@@ -54,7 +54,6 @@ tasks:
         # Bug 1269443: cache scopes, etc. must be listed explicitly
         - "docker-worker:cache:level-{{level}}-*"
         - "docker-worker:cache:tooltool-cache"
-        - "secrets:get:project/taskcluster/gecko/hgfingerprint"
         # mozilla-taskcluster will append the appropriate assume:repo:<repo>
         # scope here.