Increases logging for candidate polls (#91590)

## About The Pull Request

The game will now log when someone signs up or removes their candidacy
for ghost polls for roles.

This also fixes a runtime I experienced while testing it and running
pirates with no candidates signed up, IDK if it had any effect but it's
possible the runtime was causing the ship not to spawn.

## Why It's Good For The Game

Mostly just that I saw admins requesting this on several recent
occasions.
It's already possible to dig up some of this information through the
existing logs but it's a bit of a pain.

## Changelog

🆑
admin: Additional logging for when people sign up for ghost roles.
/🆑

config/logging.txt

@@ -29,6 +29,9 @@ LOG_ECON
 ## log emotes
 LOG_EMOTE
 
+## log ghost polling
+LOG_GHOST_POLL
+
 ## log game actions (start of round, results, etc.)
 LOG_GAME