Convert Input to Request facade

Laravel 5.2 no longer registers the `Input` facade by default. While
still available in Laravel 5, the `Input` facade is removed in
Laravel 6.

app/Http/Controllers/Agent/kb/SettingsController.php

@@ -17,7 +17,7 @@ use Config;
 use Exception;
 use Illuminate\Http\Request;
 use Image;
-use Input;
+use Illuminate\Support\Facades\Request as Input;
 use Lang;
 
 /**