Patch for MATE desktop 1.8.1 to display a correct icon for `mate-about` program

1001_correct-mate-about-program-icon.patch

From: Nachanon Vetjasit <nachanon@users.noreply.github.com>
Subject: Change mate-about's program icon to official MATE desktop icon
Bug: https://github.com/mate-desktop/mate-desktop/issues/132

--- a/mate-about/mate-about.c
+++ b/mate-about/mate-about.c
@@ -72,16 +72,16 @@
 	{
 		mate_about_dialog = (GtkAboutDialog*) gtk_about_dialog_new();
 
-		gtk_window_set_default_icon_name(desktop_icon);
-
 		GtkIconTheme* icon_theme = gtk_icon_theme_get_default();
 
 		if (gtk_icon_theme_has_icon(icon_theme, icon))
 		{
+			gtk_window_set_default_icon_name(icon);
 			gtk_about_dialog_set_logo_icon_name(mate_about_dialog, icon);
 		}
 		else
 		{
+			gtk_window_set_default_icon_name(desktop_icon);
 			gtk_about_dialog_set_logo_icon_name(mate_about_dialog, desktop_icon);
 		}
 
--- a/mate-about/mate-about.desktop.in.in
+++ b/mate-about/mate-about.desktop.in.in
@@ -2,7 +2,7 @@
 _Name=About MATE
 _Comment=Learn more about MATE
 Exec=mate-about
-Icon=desktop
+Icon=mate
 Terminal=false
 Type=Application
 Categories=GTK;Core;Utility;