Death link fix

[ScipioWright]

LUA: 17:38:29 [AP] No connection could be made because the target machine actively refused it.    
Lua error - [string "mods/archipelago/init.lua"]:73: attempt to index upvalue 'slot_options' (a nil value)
  Stack traceback:
      [string "mods/archipelago/init.lua"]:73: in function 'IsDeathLinkEnabled'
      [string "mods/archipelago/init.lua"]:574: in function <[string "mods/archipelago/init.lua"]:570>

Attempting to fix this with this PR.

When the player connected to their slot, it immediately disconnected them. I'm going to assume OnPauseChanged can happen at the main menu somewhere? Will test this tonight, just writing it up in browser on my work computer for now.

[ScipioWright]

Couldn't actually replicate the bug, but it's a simple enough check to make