Fixed MainMenuActivity to match the branched version (guess those changes
didn't get committed to master, whoops).

Also, got around to cleaning up the CardDetailFragment. Looks MUCH beter
now! Still needs a bit more, I think - probably dynamic removal of fields
unused by certain cards (forest probably shouldn't have cost or P/T fields
show up, for example) would be good, and possibly doing something nicer
with the count parameter (making it larger and more distinct, pmuch).

Confession, though: there's something of a hack in place to get my
fragment state stuff working still. Since the landscape version of the
detail fragment is fundamentally different to the portrait, I had to hack
in a linear layout into the portrait mode so I could still delete them.
This linear layout is TECHNICALLY doing nothing, but it has to exist, at
least for now.