Rename variable to avoid mis-labelling as a TODO comment

Currently this variable gets picked up by simple scans for work
labelled TODO. By renaming it we can use simple filters to find
work in need of doing.

Bug: None
Test: atest BackupFrameworksServicesRoboTests
Change-Id: I5a5b5c6e49febae2636b6b4dc97ab3e922aa3eef