[MIRROR] makes get_hearers_in_view() faster AGAIN, fixes issue with previous optimization (#6979)

* makes get_hearers_in_view() faster AGAIN, fixes issue with previous optimization

* Mirror!

Co-authored-by: Kylerace <kylerlumpkin1@gmail.com>
Co-authored-by: Funce <funce.973@gmail.com>

code/modules/assembly/voice.dm

@@ -8,7 +8,6 @@
 	desc = "A small electronic device able to record a voice sample, and send a signal when that sample is repeated."
 	icon_state = "voice"
 	custom_materials = list(/datum/material/iron=500, /datum/material/glass=50)
-	flags_1 = HEAR_1
 	attachable = TRUE
 	verb_say = "beeps"
 	verb_ask = "beeps"
@@ -25,6 +24,10 @@
 	drop_sound = 'sound/items/handling/component_drop.ogg'
 	pickup_sound =  'sound/items/handling/component_pickup.ogg'
 
+/obj/item/assembly/voice/Initialize()
+	. = ..()
+	become_hearing_sensitive(ROUNDSTART_TRAIT)
+
 /obj/item/assembly/voice/examine(mob/user)
 	. = ..()
 	. += span_notice("Use a multitool to swap between \"inclusive\", \"exclusive\", \"recognizer\", and \"voice sensor\" mode.")