update imagick function

Dont use 'none' there as jpg does not have transparency. This will result in a black image when using imagick.

Author: Keinbockwurst

src/BarcodeGeneratorJPG.php

@@ -38,7 +38,7 @@ public function getBarcode($code, $type, $widthFactor = 2, $totalHeight = 30, $c
             $imagick = true;
             $colorForeground = new \imagickpixel('rgb(' . $color[0] . ',' . $color[1] . ',' . $color[2] . ')');
             $jpg = new \Imagick();
-            $jpg->newImage($width, $height, 'none', 'jpg');
+            $jpg->newImage($width, $height, 'white', 'jpg');
             $imageMagickObject = new \imagickdraw();
             $imageMagickObject->setFillColor($colorForeground);
         } else {
@@ -74,4 +74,4 @@ public function getBarcode($code, $type, $widthFactor = 2, $totalHeight = 30, $c
 
         return $image;
     }
-}
+}