Preference menu buttons are disabled until subsystem initializes (#90685)

code/modules/client/preferences.dm

@@ -135,6 +135,10 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 	// I'm making the assumption that ui close will be called whenever a user logs out, or loses a window
 	// If this isn't the case, kill me and restore the code, thanks
 
+	// We need IconForge and the assets to be ready before allowing the menu to open
+	if(SSearly_assets.initialized != INITIALIZATION_INNEW_REGULAR)
+		return
+
 	ui = SStgui.try_update_ui(user, src, ui)
 	if(!ui)
 		character_preview_view = create_character_preview_view(user)