Change default image font color for feed

Author: Helman Budianto

src/Stackla/Api/Widget.php

@@ -466,7 +466,7 @@ public function setDefaultValue()
                     'text_tile_font_color' => '666666',
                     'text_tile_font_size' => 18,
                     'image_tile_background' => 'ffffff',
-                    'image_tile_font_color' => 'ffffff',
+                    'image_tile_font_color' => '666666',
                     'image_tile_font_size' => 18,
                     'width' => 970,
                     'height' => 600,