DisplaySettings: Remove icon from browse-for-wallpaper button

The icon on this button looked out of place.

Userland/Applications/DisplaySettings/BackgroundSettingsWidget.cpp

@@ -61,7 +61,6 @@ void BackgroundSettingsWidget::create_frame()
     };
 
     auto& button = *find_descendant_of_type_named<GUI::Button>("wallpaper_open_button");
-    button.set_icon(Gfx::Bitmap::load_from_file("/res/icons/16x16/open.png"));
     button.on_click = [this](auto) {
         auto path = GUI::FilePicker::get_open_filepath(nullptr, "Select wallpaper from file system.");
         if (!path.has_value())