Ghost health scan usable range increase (#6307)

# About the pull request

The "Scan Health" verb can now be used by ghosts on any visible mob.

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# Explain why it's good for the game

Currently ghost's "Scan Health" only works on mobs that are within the
default view distance, even though ghosts can zoom out significantly
farther. This allows the ghost to scan anything their client can see.
# 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:
qol: ghost "Scan Health" works at any range
/:cl:

code/modules/mob/dead/observer/observer.dm

@@ -655,7 +655,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 	usr.forceMove(pick(L))
 	following = null
 
-/mob/dead/observer/proc/scan_health(mob/living/target in oview())
+/mob/dead/observer/proc/scan_health(mob/living/target in view(src.client))
 	set name = "Scan Health"
 
 	if(!istype(target))