npc_manage_processing.php: give NPCs starting credits
npc_manage_processing.php: give NPCs starting credits

NPC players were being created with the default credits in the `player`
table (only 5k credits) instead of the starting credits defined for the
game (usually ~100k credits). This caused them to often be unable to
make their first trade!

hemberger/smr,hemberger/smr,smrealms/smr,hemberger/smr,hemberger/smr,smrealms/smr,smrealms/smr