Summary: The electron stub is used by the headless version of Flipper. For that reason, the version number was always `1`. The headless version has a the actual version written to a global variable. So let's use it here.
Reviewed By: passy
Differential Revision: D14149692
fbshipit-source-id: c4781987fd3201e67897eaf31627b0bb2970ffcb