tgui radios; clean up frequency code

code/modules/tgui/states/inventory.dm

@@ -7,6 +7,6 @@
 /var/global/datum/ui_state/inventory_state/inventory_state = new()
 
 /datum/ui_state/inventory_state/can_use_topic(src_object, mob/user)
-	if(!(src_object in user))
+	if(!(src_object in user.contents))
 		return UI_CLOSE
 	return user.shared_ui_interaction(src_object)

code/modules/tgui/tgui.dm

@@ -244,10 +244,11 @@
 		json_data["data"] = data
 		json_data["adata"] = data
 
-	// Generate the JSON; replace bad characters.
+	// Generate the JSON.
 	var/json = JSON.stringify(json_data)
-	json = replacetextEx(json, "\improper", "")
-
+	// Strip #255/improper.
+	json = regex_replaceall(json, "\improper", "")
+	json = regex_replaceall(json, "\proper", "")
 	return json
 
  /**