Picking up grenades resets explosion timer #71

Describe the bug
Picking up an activated grenade will reset its timer, making it possible to throw one back and forth without it ever exploding.

To Reproduce
Have two actors
Throw a grenade from one to the other
Pick up the activated grenade and throw it back
Repeat
Observe as it never explodes

Expected behavior
Grenades should not reset their timer and explode at the correct time from first activation even if picked up.