Fixed overflow role not actually being overflow anymore after ResetOccupation is called (#78556)

## About The Pull Request
See title. Calling ResetOccupation doesn't re-apply the overflow role
correctly so it has reduced slots when it shouldn't.

## Why It's Good For The Game
Bugfix

## Changelog
🆑
fix: Fixed the overflow role having less slots than it actually should.
/🆑

Co-authored-by: Watermelon914 <3052169-Watermelon914@users.noreply.gitlab.com>

code/controllers/subsystem/job.dm

@@ -299,6 +299,8 @@ SUBSYSTEM_DEF(job)
 		player.mind.special_role = null
 	SetupOccupations()
 	unassigned = list()
+	if(overflow_role)
+		set_overflow_role(overflow_role)
 	return