remove a pointless static var from radios

likely fixes some issue because it was nulled in disposing scream
also OpenDream doesn't seem to support default var values being global vars so there's that

code/obj/item/device/radio.dm

@@ -32,7 +32,6 @@ TYPEINFO(/obj/item/device/radio)
 	var/has_microphone = TRUE
 	var/list/datum/component/packet_connected/radio/secure_connections = null
 	var/speaker_range = 2
-	var/static/mutable_appearance/speech_bubble = living_speech_bubble //typing_indicator.dm
 	///This is for being able to run through signal jammers (just solar flares for now). acceptable values = 0 and 1.
 	var/hardened = 1
 	///Set to make it not work, used by flock victory screech
@@ -75,7 +74,6 @@ var/list/headset_channel_lookup
 	src.traitorradio  = null
 	src.secure_connections = null
 	src.secure_frequencies = null
-	src.speech_bubble = null
 	..()
 
 /obj/item/device/radio/proc/set_frequency(new_frequency)
@@ -636,7 +634,7 @@ var/list/headset_channel_lookup
 
 /obj/item/device/radio/proc/speech_bubble(var/bubbleOverride)
 	if (!bubbleOverride)
-		bubbleOverride = src.speech_bubble
+		bubbleOverride = global.living_speech_bubble
 	if ((src.listening && src.wires & WIRE_RECEIVE))
 		if (istype(src, /obj/item/device/radio/intercom))
 			UpdateOverlays(bubbleOverride, "speech_bubble")

code/obj/item/device/studio_monitor.dm

@@ -46,7 +46,7 @@ TYPEINFO(/obj/item/device/radio/nukie_studio_monitor)
 		return hear
 
 	speech_bubble()
-		UpdateOverlays(speech_bubble, "speech_bubble")
+		UpdateOverlays(global.living_speech_bubble, "speech_bubble")
 		SPAWN(1.5 SECONDS)
 			UpdateOverlays(null, "speech_bubble")