feat(radar): improve 'onViewChanged' event handler

Use the new 'onViewChanged' event parameters to only add/remove the radar
input frame if the view changes to/from "WorldView".

data/pigui/modules/radar.lua

@@ -38,6 +38,10 @@ input_frame:AddAction(keys.radar_toggle_mode)
 input_frame:AddAction(keys.radar_zoom_in)
 input_frame:AddAction(keys.radar_zoom_out)
 
+keys.radar_reset:OnPressed(function()
+	print("[DBG] radar_reset pressed.")
+end)
+
 local function getColorFor(item)
 	local body = item.body
 	if body == player:GetNavTarget() then
@@ -377,10 +381,10 @@ local function displayRadar()
 end -- function displayRadar()
 
 -- view has changed, update input frame
-Event.Register("onViewChanged", function()
-	if Game.CurrentView() == "WorldView" then
+Event.Register("onViewChanged", function(newView, previousView)
+	if newView == "WorldView" then
 		input_frame:AddToStack()
-	else
+	elseif previousView == "WorldView" then
 		input_frame:RemoveFromStack()
 	end
 end)