scripts/calcurse-upgrade: Set "-e"
scripts/calcurse-upgrade: Set "-e"

From the set(1p) man page:

  When this option is on, if a simple command fails for any of the
  reasons listed in Consequences of Shell Errors or returns an exit
  status value >0, and is not part of the compound list following a
  while, until, or if keyword, and is not a part of an AND or OR list,
  and is not a pipeline preceded by the ! reserved word, then the shell
  shall immediately exit.

This allows us to remove all the "|| exit 1" statements we used to bail
out if one command fails.

Signed-off-by: Lukas Fleischer <af90e31281d8305af43dc616c5aaca3c7165f8a7@cryptocrack.de>

lfos/calcurse,lfos/calcurse,lfos/calcurse