mobile: improve Android back key behavior

There are two places where we try to prevemt unintended app exits.
Once, in the onBackRequested signal handler on the dive list. This was
missing special handling for the situation where one of the drawers was
open.
The second place is the onClosing signal handler in main.qml. Naively I
thought that this was enough to catch all cases where we were about to
exit the app, but apparently an explicit manager.quit() is a bit too
forceful and doesn't get to that signal handler.

With this commit we check for open drawers in both places. Belts and
suspenders, I guess.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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