Headspidered victim dying should let the spider instantly take over

[Mouse]

The host dying used to not kill the headspider.  I think it was supposed to take over on death but it didn't work very well, resulting in things like a living headspider in a decapitated corpse* or a living headspider inside the enzymatic reclaimer that could survive it being activated.**

*An admin teleported it out and it reinfected me when i went to get my corpse.
**An admin teleported me out due to a misunderstanding.  I was fine being stuck there I just wanted to be renamed "enzymatic reclaimer" so medbay would know who was demanding to be fed dead bodies.