Change mob spawn time in OGH hard and normal (2nd zone)

Imported from legacy Flarum.
Original author: amel5284 (Flarum #1678)

Now in OGH hard/normal (2nd zone, rooms after 1st boss) mob spawn looks like a wave mode. Change it for instant spawn.

Many players don’t want to complete this dungeon because it takes a long time. This change will allow players to complete instance a little faster. Faster instance → +popularity → more run (if have char) → more mats → cheap mats → more affordable craft/enchant next equip.

I think this change not disbalance, looks like a OGHC 10 lvl account share change