[MIRROR] Fix not being able to stop looking vertically (#2786)

* Fix not being able to stop looking vertically (#83503)

## About The Pull Request
This fixes a bug with the look down/up verbs where you are not able to
*stop* looking unless you're on a tile where you're able to *start*
looking.

## Why It's Good For The Game

![image](https://github.com/tgstation/tgstation/assets/16826524/6cafddbb-2f52-47d5-839e-dfac1595521d)


## Changelog
:cl:
fix: you are now able to cancel the look up/down verbs from anywhere
/:cl:

* Fix not being able to stop looking vertically

---------

Co-authored-by: Echriser <[email protected]>
Co-authored-by: NovaBot13 <[email protected]>

code/modules/mob/living/living.dm

@@ -2226,6 +2226,7 @@ GLOBAL_LIST_EMPTY(fire_appearances)
 			to_chat(src, span_warning("You can't see through the floor above you."))
 			return
 
+	looking_vertically = TRUE
 	reset_perspective(ceiling)
 
 /mob/living/proc/stop_look_up()
@@ -2234,6 +2235,7 @@ GLOBAL_LIST_EMPTY(fire_appearances)
 
 /mob/living/proc/end_look_up()
 	stop_look_up()
+	looking_vertically = FALSE
 	UnregisterSignal(src, COMSIG_MOVABLE_PRE_MOVE)
 	UnregisterSignal(src, COMSIG_MOVABLE_MOVED)
 
@@ -2276,6 +2278,7 @@ GLOBAL_LIST_EMPTY(fire_appearances)
 			to_chat(src, span_warning("You can't see through the floor below you."))
 			return
 
+	looking_vertically = TRUE
 	reset_perspective(lower_level)
 
 /mob/living/proc/stop_look_down()
@@ -2284,6 +2287,7 @@ GLOBAL_LIST_EMPTY(fire_appearances)
 
 /mob/living/proc/end_look_down()
 	stop_look_down()
+	looking_vertically = FALSE
 	UnregisterSignal(src, COMSIG_MOVABLE_PRE_MOVE)
 	UnregisterSignal(src, COMSIG_MOVABLE_MOVED)
 
@@ -2781,7 +2785,7 @@ GLOBAL_LIST_EMPTY(fire_appearances)
 	set name = "Look Up"
 	set category = "IC"
 
-	if(client.perspective != MOB_PERSPECTIVE)
+	if(looking_vertically)
 		end_look_up()
 	else
 		look_up()
@@ -2790,7 +2794,7 @@ GLOBAL_LIST_EMPTY(fire_appearances)
 	set name = "Look Down"
 	set category = "IC"
 
-	if(client.perspective != MOB_PERSPECTIVE)
+	if(looking_vertically)
 		end_look_down()
 	else
 		look_down()

code/modules/mob/living/living_defines.dm

@@ -214,6 +214,9 @@
 	///what multiplicative slowdown we get from turfs currently.
 	var/current_turf_slowdown = 0
 
+	/// Is the mob looking vertically
+	var/looking_vertically = FALSE
+
 	/// Living mob's mood datum
 	var/datum/mood/mob_mood