More istypes replaced with helpers (#20767)

* shouldn't you be merging these by now

* my oh my do we have a lot of these

* a fellow pedantic shit

code/modules/hydroponics/gene_modder.dm

@@ -104,7 +104,7 @@
 		return
 
 	var/datum/browser/popup = new(user, "plantdna", "Plant DNA Manipulator", 450, 600)
-	if(!( in_range(src, user) || istype(user, /mob/living/silicon) ))
+	if(!(in_range(src, user) || issilicon(user)))
 		popup.close()
 		return
 

code/modules/hydroponics/grown/replicapod.dm

@@ -58,7 +58,7 @@
 	if(config.revival_pod_plants)
 		if(ckey)
 			for(var/mob/M in player_list)
-				if(istype(M, /mob/dead/observer))
+				if(isobserver(M))
 					var/mob/dead/observer/O = M
 					if(O.ckey == ckey && O.can_reenter_corpse)
 						make_podman = 1

code/modules/hydroponics/hydroponics.dm

@@ -870,7 +870,7 @@
 		return ..()
 
 /obj/machinery/hydroponics/attack_hand(mob/user)
-	if(istype(user, /mob/living/silicon))		//How does AI know what plant is?
+	if(issilicon(user)) //How does AI know what plant is?
 		return
 	if(harvest)
 		myseed.harvest(user)