Fixed instant summon behavior with simple animals (#35780)

Removed hand slots from lots of things that should not have them

code/modules/mob/living/carbon/carbon_defines.dm

@@ -4,6 +4,7 @@
 	possible_a_intents = list(INTENT_HELP, INTENT_HARM)
 	hud_possible = list(HEALTH_HUD,STATUS_HUD,ANTAG_HUD,GLAND_HUD)
 	has_limbs = 1
+	held_items = list(null, null)
 	var/list/stomach_contents		= list()
 	var/list/internal_organs		= list()	//List of /obj/item/organ in the mob. They don't go in the contents for some reason I don't want to know.
 	var/list/internal_organs_slot= list() //Same as above, but stores "slot ID" - "organ" pairs for easy access.

code/modules/mob/living/simple_animal/friendly/drone/_drone.dm

@@ -49,6 +49,7 @@
 	dextrous_hud_type = /datum/hud/dextrous/drone
 	lighting_alpha = LIGHTING_PLANE_ALPHA_MOSTLY_INVISIBLE
 	can_be_held = TRUE
+	held_items = list(null, null)
 	var/staticChoice = "static"
 	var/list/staticChoices = list("static", "blank", "letter", "animal")
 	var/picked = FALSE //Have we picked our visual appearence (+ colour if applicable)

code/modules/mob/living/simple_animal/guardian/types/dextrous.dm

@@ -8,6 +8,7 @@
 	tech_fluff_string = "<span class='holoparasite'>Boot sequence complete. Dextrous combat modules loaded. Holoparasite swarm online.</span>"
 	carp_fluff_string = "<span class='holoparasite'>CARP CARP CARP! You caught one! It can hold stuff in its fins, sort of.</span>"
 	dextrous = 1
+	held_items = list(null, null)
 	environment_target_typecache = list(
 	/obj/machinery/door/window,
 	/obj/structure/window,

code/modules/mob/living/simple_animal/simple_animal.dm

@@ -508,7 +508,7 @@
 			H.update_icon()
 
 /mob/living/simple_animal/put_in_hands(obj/item/I, del_on_fail = FALSE, merge_stacks = TRUE)
-	..(I, del_on_fail, merge_stacks)
+	. = ..(I, del_on_fail, merge_stacks)
 	update_inv_hands()
 
 /mob/living/simple_animal/update_inv_hands()