Revert previous, script_shot still fails with certain modifiers

Allow more enemies to get modifiers now that script_shot is fixed by Nolla

Excluded Lightning Thrower modifier because of its instakill capability

Modifier drop chance default 0

Stability stability

Added SetRandomSeed to drop_modifier.lua

Enemies don't drop their modifiers when using the monsters_drop_your_guns mod since that mod handles this in its own way.

There's now a configurable chance for enemies to drop their modifier on death. Default 1% chance.

Excluded a few modifiers that don't do anything. Lost Soul from New Enemies doesn't get modifiers now, because it can cause crashes with them.

More stability