mmenu: introduced artificial delay after SD event (ins/eject); mmenu is racing agains...

mmenu: introduced artificial delay after SD event (ins/eject); mmenu is racing against pndnotifyd
and if mmenu wakes up first, then the lockfile is not yet present and mmenu sees minimal changes..
so if we make mmenu wait a second or two then almost certainly pndnotifyd should have awoken and
set up its lockfile. (Another option is to tweak pndnotifyd to wake up more often, but I prefer
not to bother that application as it is omnipresent .. lets avoid introducing cpu leach.)