#13499: Command amplification no longer applies to non-comms line

Make a copy of message_pieces when instancing message datum for radio speech to allow editing the radio line without affecting the actual line

code/game/objects/items/devices/radio/radio.dm

@@ -411,11 +411,16 @@ GLOBAL_LIST_INIT(default_medbay_channels, list(
 		jobname = "Unknown"
 		voicemask = TRUE
 
+	// Copy the message pieces so we can safely edit comms line without affecting the actual line
+	var/list/message_pieces_copy = list()
+	for(var/datum/multilingual_say_piece/S in message_pieces)
+		message_pieces_copy += new /datum/multilingual_say_piece(S.speaking, S.message)
+
 	// Make us a message datum!
 	var/datum/tcomms_message/tcm = new
 	tcm.sender_name = displayname
 	tcm.sender_job = jobname
-	tcm.message_pieces = message_pieces
+	tcm.message_pieces = message_pieces_copy
 	tcm.source_level = position.z
 	tcm.freq = connection.frequency
 	tcm.vmask = voicemask