Fix crash report dialog and store LRU world generator

Two very small bugfixes

Note: The LRU seed value is not read back from the config, although an entry exists. That part is commented out. 

I think it would sometimes be nice to re-create the exact same world (debugging!), but on the other hand it would also be nice to have auto-generated new seed values. 

Maybe we should load the value by default and add a button "generate new seed" sometime..