twinkle: Move nuisance error to console (wikimedia-gadgets#1998) (wik…

…imedia-gadgets#2002)

The error message for a failed network request to get preferences is now
logged to console instead of being shown as a popup. The error fires
if the user navigates away from the page before the request completes,
leading to unwanted popups.

twinkle.js

@@ -323,7 +323,7 @@ $.ajax({
 	dataType: 'text'
 })
 	.fail(function () {
-		mw.notify('Could not load your Twinkle preferences, resorting to default preferences');
+		console.log('Could not load your Twinkle preferences, resorting to default preferences'); // eslint-disable-line no-console
 	})
 	.done(function (optionsText) {