Fixes Pathfinder module AGAIN, General JPS Tweak (#84348)

## About The Pull Request

1. Fixes the modsuit pathfinder module's pathfinding for the second
time. This time AI idling broke it, we just make it not idle.
2. Changes the heuristic used by JPS nodes from Chebyshev distance to
Euclidean distance. I have no real logical explanation, it just appeared
to produce a more optimal path. CC @LemonInTheDark
3. Renames `get_dist_euclidian()` to `get_dist_euclidean()`.

Red line: Euclidean dist JPS path (roughly)
Green line: Chebyshev dist JPS path (roughly)

![image](https://github.com/tgstation/tgstation/assets/75460809/57d75ff3-ee6d-4f73-82da-0e66e026d790)
## Changelog
🆑
fix: MODsuit pathfinder module works. Again.
code: AI pathfinding should produce slightly better paths.
/🆑

code/modules/modular_computers/file_system/programs/radar.dm

@@ -114,7 +114,7 @@
 	var/locx = (target_turf.x - here_turf.x) + 24
 	var/locy = (here_turf.y - target_turf.y) + 24
 
-	if(get_dist_euclidian(here_turf, target_turf) > 24)
+	if(get_dist_euclidean(here_turf, target_turf) > 24)
 		userot = TRUE
 		rot = round(get_angle(here_turf, target_turf))
 	else
@@ -208,7 +208,7 @@
 
 	var/here_turf = get_turf(computer)
 	var/target_turf = get_turf(signal)
-	var/trackdistance = get_dist_euclidian(here_turf, target_turf)
+	var/trackdistance = get_dist_euclidean(here_turf, target_turf)
 	switch(trackdistance)
 		if(0)
 			program_open_overlay = "[initial(program_open_overlay)]direct"
@@ -471,7 +471,7 @@
  */
 /obj/item/circuit_component/mod_program/radar/proc/can_track(datum/source, atom/signal, signal_turf, computer_turf)
 	SIGNAL_HANDLER
-	if(target.value && get_dist_euclidian(computer_turf, signal_turf) > MAX_RADAR_CIRCUIT_DISTANCE)
+	if(target.value && get_dist_euclidean(computer_turf, signal_turf) > MAX_RADAR_CIRCUIT_DISTANCE)
 		return COMPONENT_RADAR_DONT_TRACK
 	return COMPONENT_RADAR_TRACK_ANYWAY