spinner: Don't arbitrarily limit sizes anymore

This essentially reverts b33877e173

Now that we can theme the spinner as a real icon using -gtk-icontheme()
this limit is no longer necessary.

gtk/gtkspinner.c

@@ -200,12 +200,6 @@ gtk_spinner_draw (GtkWidget *widget,
   height = gtk_widget_get_allocated_height (widget);
   size = MIN (width, height);
 
-  /* at most allow a double size spinner */
-  if (size >= 3 * SPINNER_SIZE)
-    size = SPINNER_SIZE * 2;
-  else
-    size = SPINNER_SIZE;
-
   gtk_render_activity (context, cr,
                        (width - size) / 2,
                        (height - size) / 2,