move My Submissions to primary nav (bug 860373)

Note that only comment #13 (https://bugzilla.mozilla.org/show_bug.cgi?id=860373#c13) is relevant. The discussion around this minor issue got a bit out of hand and was reined back in.
> why would we remove the link to submit an app?

Because I was testing different things and reverted a bunch of changes, then checked in the wrong damn thing. Thanks for catching that. I meant to remove the whole My Submissions drop-down (since there is now a link to My Submissions in the main menu).