Keycard authentication device now reqires two users to activate events (

#6903)

# About the pull request

it is writen down that two are reqired to activate red and so on but one
can swipe twice fast and it work. this fixes it

# Explain why it's good for the game

bugfix and has rp incentive to get second man to start redalert


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
fix: two persons are needed to activate red, ert and emergency acces
using cards
/:cl:

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Co-authored-by: vincibrv <[email protected]>

code/modules/security_levels/keycard_authentication.dm

@@ -36,8 +36,11 @@
 			if(active == 1)
 				//This is not the device that made the initial request. It is the device confirming the request.
 				if(event_source)
+					if(event_source.event_triggered_by == user)
+						user.visible_message(SPAN_DANGER("Your ID is rejected, as it is the one that triggered the event!"))
+						return
 					event_source.confirmed = 1
-					event_source.event_confirmed_by = usr
+					event_source.event_confirmed_by = user
 			else if(screen == 2)
 				event_triggered_by = usr
 				broadcast_request() //This is the device making the initial event request. It needs to broadcast to other devices