[FIXED] Preplaced lemmings influence starting hatch [BUG] [PLAYER]

[Nepster]

This bug is the cause of some of the problems in Flopsy's recent bug report.

Assume a level has p preplaced lemmings and n hatches (indexed by 0, 1, ..., n-1). Then the first lemming should spawn in hatch number 0, but instead is spawns in hatch number p mod n.

[Nepster]

...and fixed for the next NL update.