Summary:
Removes the top-level return used in `run-android-ci-instrumentation-tests.js`.

This prevents the file from being parsed as a module. The top-level return here doesn't serve any purpose because it doesn't block the execution of any code after it, as there is no more code to execute.

Reviewed By: cpojer

Differential Revision: D15000395

fbshipit-source-id: 7acf010bb25dec5048813d01517875bcb6eb5a15