Atom doesn't remember full-screen state without project context

[jbarnette]

1. Open Atom without context, via Spotlight or Applications
2. Full-screen Atom
3. Quit
4. Open Atom the same way

I expect Atom to still be full-screen, but it's not.

/cc #1144

[jbarnette]

Two of these with the exact same body comment but slightly different titles. No idea.

[lock]

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