fix main screen destruction order,

so plugins can cleanup before their facilities get destroyed

src/main_screen.hpp

@@ -48,8 +48,6 @@ struct MainScreen final : public Screen {
 	RegistryMessageModel rmm;
 	MessageTimeSort mts;
 
-	PluginManager pm;
-
 	ToxEventLogger tel{std::cout};
 	ToxClient tc;
 	ToxPrivateImpl tpi;
@@ -75,6 +73,8 @@ struct MainScreen final : public Screen {
 	ToxUIUtils tuiu;
 	ToxDHTCapHisto tdch;
 
+	PluginManager pm; // last, so it gets destroyed first
+
 	bool _show_tool_style_editor {false};
 	bool _show_tool_metrics {false};
 	bool _show_tool_debug_log {false};