[PR] EMAG disables borg interface locks instead of freeing them

[glowbold]

I think it should open the chest component (`src.opened`) instead of the head case for the following reasons:
* Prevents two-click, no tool round removal (emag -> swap hands -> grab brain)
* Emagger can remove the power cell to prevent radio callouts/immediate reprisals (borgs with no cell can still move, but can't use radio/tools)
* Emagger can immediately use a cyborg law linker to link them to a new rack (yay synergy)