Fix issues found by static analysis (#878)

app/Http/Controllers/Settings/MultiFAController.php

@@ -2,8 +2,8 @@
 
 namespace App\Http\Controllers\Settings;
 
-use Google2FA;
 use Illuminate\Http\Request;
+use PragmaRX\Google2FA\Google2FA;
 use App\Http\Controllers\Controller;
 use Illuminate\Foundation\Auth\RedirectsUsers;
 use PragmaRX\Google2FALaravel\Support\Authenticator;
@@ -41,7 +41,7 @@ class MultiFAController extends Controller
         $user = $request->user();
 
         //generate image for QR barcode
-        $imageDataUri = Google2FA::getQRCodeInline(
+        $imageDataUri = app('pragmarx.google2fa')->getQRCodeInline(
             $request->getHttpHost(),
             $user->email,
             $secret,