Fix admins without R_POLL getting (an unusable) poll verb (#79461)

## About The Pull Request

Copy paste error, I assume. 

`admin_verbs_poll` only contains `/client/proc/poll_panel` which
requires `R_POLL` to use.

## Changelog

🆑 Melbert
admin: Admins without `R_POLL` no longer have access to "Server Poll
Management", not that they could have used it anyways.
/🆑

code/modules/admin/admin_verbs.dm

@@ -265,7 +265,7 @@ GLOBAL_PROTECT(admin_verbs_poll)
 			add_verb(src, GLOB.admin_verbs_permissions)
 		if(rights & R_STEALTH)
 			add_verb(src, /client/proc/stealth)
-		if(rights & R_ADMIN)
+		if(rights & R_POLL)
 			add_verb(src, GLOB.admin_verbs_poll)
 		if(rights & R_SOUND)
 			add_verb(src, GLOB.admin_verbs_sounds)