Summary:
This error messaging is confusing for device only users. These users may only be running against a device **without xcode installed**, which is supported.
However, we also need to handle the case where a user has a sim running and they haven't xcode-select'd as this will mean that the sim is working fine, but the user has no way of knowing why Flipper is not working.
Reviewed By: passy
Differential Revision: D34140277
fbshipit-source-id: f9b035b6c7918424d6131d1dfcdba10acf438fa8
9973014116