Add a clarifying comment on the image processor name

Signed-off-by: Eric Promislow <epromislow@suse.com>

background.ts

@@ -26,7 +26,8 @@ import buildApplicationMenu from '@/main/mainmenu';
 Electron.app.setName('Rancher Desktop');
 
 const console = Logging.background;
-// Maybe let people switch this on the fly
+// If/when we support more than one image processor this will be a pref with a watcher
+// for changes, but it's fine as a constant now.
 const ImageProviderName = 'nerdctl';
 
 const k8smanager = newK8sManager();