Go Big or Go Home! #5163
Make the Home button fallback to sane values in case no custom home directory is set (re #5154 ).
(The QuickStart Guide properly introduces the long-press as the way to set defaults, so I'm not too torn up about mostly getting rid of that bit of QoL cuteness that may actually mean people wouldn't remember that long-presses are awesome in KOReader).
Pinging @pazos about the Android default.
On the one hand, I like that it shows people where we live so they can find the settings manually later, on the other hand, no-one in their right mind should actually use this as their Home :D.
/sdcard/Downloads might be better? Or /sdcard?
I don't actually remember where a brand new install sends us...