Minor dissoluted devourer corrections

[Karol1223]

Summary

None

Purpose of change

It upset me it was the same size as a single human corpse

Describe the solution

• Increased the volume and weight x3, to go in hand with the fact that it drops 3 sets of corpse loots by default
• Removed PATH_AVOID_DANGER, since there's no apparent reason for it to be intelligent enough to do so

Describe alternatives you've considered

Testing

Additional context