Renames the round-ending admin secrets to something much less questionable (#22669)

The admin commands to set off events that end the round (Supermatter
cascade and Summon Narsie) were in a category with a problematic name

(redid the PR after i broke it with a bad merge oops)

code/modules/admin/admin_secrets.dm

@@ -78,8 +78,8 @@ var/datum/admin_secrets/admin_secrets = new()
 /datum/admin_secret_category/fun_secrets
 	name = "Fun Secrets"
 
-/datum/admin_secret_category/final_solutions
-	name = "Final Solutions"
+/datum/admin_secret_category/roundending_secrets
+	name = "Round-ending Secrets"
 	desc = "(Warning, these will end the round!)"
 
 /*************************
@@ -100,6 +100,6 @@ var/datum/admin_secrets/admin_secrets = new()
 	permissions = R_FUN
 	warn_before_use = 1
 
-/datum/admin_secret_item/final_solution
-	category = /datum/admin_secret_category/final_solutions
+/datum/admin_secret_item/round_ending_secret
+	category = /datum/admin_secret_category/roundending_secrets
 	permissions = R_FUN|R_SERVER|R_ADMIN

code/modules/admin/secrets/roundending_secrets/summon_narsie.dm

@@ -1,7 +1,7 @@
-/datum/admin_secret_item/final_solution/summon_narsie
+/datum/admin_secret_item/round_ending_secret/summon_narsie
 	name = "Summon Nar-Sie"
 
-/datum/admin_secret_item/final_solution/summon_narsie/execute(var/mob/user)
+/datum/admin_secret_item/round_ending_secret/summon_narsie/execute(var/mob/user)
 	. = ..()
 	if(!.)
 		return

code/modules/admin/secrets/roundending_secrets/supermatter_cascade.dm

@@ -1,7 +1,7 @@
-/datum/admin_secret_item/final_solution/supermatter_cascade
+/datum/admin_secret_item/round_ending_secret/supermatter_cascade
 	name = "Supermatter Cascade"
 
-/datum/admin_secret_item/final_solution/supermatter_cascade/execute(var/mob/user)
+/datum/admin_secret_item/round_ending_secret/supermatter_cascade/execute(var/mob/user)
 	. = ..()
 	if(!.)
 		return