fix MenuButton icon

Author: shadeyg56

auto_cpufreq/gui/objects.py

@@ -144,7 +144,7 @@ def __init__(self, parent):
                     width=25,
                     height=25,
                     preserve_aspect_ratio=True)
-        self.image = Gtk.Image.new_from_pixbuf(img_buffer)
+        self.image = Gtk.Image.new_from_icon_name("open-menu-symbolic", Gtk.IconSize.MENU)
         self.add(self.image)
         self.menu = self.build_menu(parent)
         self.set_popup(self.menu)

images/menu.png

@@ -10,8 +10,3 @@ label{
 #small{
     font-size: 12px;
 }
-
-button.popup{
-    background-image: none;
-    background-color: white;
-}