Summary: As reported here: https://github.com/facebook/flipper/issues/2873, ADB would be initialised, even when disabled explicitly, resulting in an error if ADB could not be found. Changelog: Fix: made sure that the "Android disabled" setting is respected. Reviewed By: lblasa Differential Revision: D31019099 fbshipit-source-id: 9d57945f2c21655426da42eb976dd46d8605d007