Move menu call into app.on-ready function
Move menu call into app.on-ready function

  * Custom menu is still visible and ABCMgr title displayed on Ubuntu.

Signed-off-by: <62b1a4b1cb52bcf40f8267031eadbe72224a36da@gmail.com>

nexB/aboutcode-manager,nexB/aboutcode-manager,nexB/aboutcode-manager