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Fix Starlark lint errors in Android prelude

Summary: Rename two used local bindings that start with `_`. Buck2's Starlark linter reserves underscore-prefixed bindings for ignored values, so D111489524 caused `test_lint_buck2` to report five findings.

Reviewed By: bcardosolopes

Differential Revision: D122877778

fbshipit-source-id: 56b612726f282e26b4728ca139b533988b9de07a