Save installation success independet of state. This fixes a bug that you can have a new list available but currently a transfer error. Now the actual saving / removal of the old list is only dependent on the list that is available in the settings.

aheinecke@intevation.de=Andre Heinecke
andre.heinecke@intevation.de=Andre Heinecke
bernhard@intevation.de=Bernhard Reiter
rrenkert@intevation.de=Raimund Renkert
wilde@intevation.de=Sascha Wilde
emanuel@intevation.de=Emanuel Schütze