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gtk: Adjust to reordering of XPM icons

Commit cc7f550 "Migrate to a CMake-based build system." reversed the
order of xpm_icons, so the largest icon (96x96) is now first and
the smallest (16x16) is now last.

The About dialog now shows the smallest icon, and the window icon is
now the largest icon.

Change the array indexing so that the same size icons are used as
before.

Fixes: cc7f5503dc8f ("Migrate to a CMake-based build system.")

--- a/gtk.c

+++ b/gtk.c

@@ -3004,7 +3004,7 @@

     if (n_xpm_icons) {

         GdkPixbuf *icon = gdk_pixbuf_new_from_xpm_data

-            ((const gchar **)xpm_icons[n_xpm_icons-1]);

+            ((const gchar **)xpm_icons[0]);

         gtk_show_about_dialog

             (GTK_WINDOW(fe->window),

@@ -3558,7 +3558,7 @@

     if (n_xpm_icons) {

         gtk_window_set_icon(GTK_WINDOW(fe->window),

                             gdk_pixbuf_new_from_xpm_data

-                            ((const gchar **)xpm_icons[0]));

+                            ((const gchar **)xpm_icons[n_xpm_icons-1]));

 	iconlist = NULL;

 	for (n = 0; n < n_xpm_icons; n++) {