remove assignment scope shim for analytics

refs CNVS-15925

no tests needed

Change-Id: I70cd02dd49001e79093f501601094240e1d14f50
Reviewed-on: https://gerrit.instructure.com/43576
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cameron Sutter <csutter@instructure.com>
Product-Review: Simon Williams <simon@instructure.com>
QA-Review: Simon Williams <simon@instructure.com>