Adds a confirmation to disabling round end delay (#4455)

# About the pull request

Multiple people press at once and it doesn't delay
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# Explain why it's good for the game

Not delaying when should delay
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>


![image](https://github.com/cmss13-devs/cmss13/assets/56142455/cf0505aa-de19-4657-a166-5b206c0917d5)

</details>


# Changelog
:cl:
admin: Disabling round end delay has a confirmation
/:cl:

code/modules/admin/tabs/round_tab.dm

@@ -148,7 +148,10 @@
 
 	if(!check_rights(R_SERVER))
 		return
-	if (SSticker.current_state != GAME_STATE_PREGAME)
+	if(SSticker.current_state != GAME_STATE_PREGAME)
+		if(SSticker.delay_end)
+			if(tgui_alert(usr, "Round end delay is already enabled, are you sure you want to disable it?", "Confirmation", list("Yes", "No"), 30 SECONDS) != "Yes")
+				return
 		SSticker.delay_end = !SSticker.delay_end
 		message_admins("[SPAN_NOTICE("[key_name(usr)] [SSticker.delay_end ? "delayed the round end" : "has made the round end normally"].")]")
 		for(var/client/C in GLOB.admins)