Adjust gdk-pixbuf loader for new API change

contrib/gdk-pixbuf/loader.c

diff --git a/contrib/gdk-pixbuf/loader.c b/contrib/gdk-pixbuf/loader.c
index 3c99a29..88c2e17 100644
--- a/contrib/gdk-pixbuf/loader.c
+++ b/contrib/gdk-pixbuf/loader.c
@@ -208,7 +208,7 @@
     if (image->transformFlags & AVIF_TRANSFORM_IMIR) {
         GdkPixbuf *output_mirrored = NULL;
 
-        switch (image->imir.axis) {
+        switch (image->imir.mode) {
         case 0:
             output_mirrored = gdk_pixbuf_flip(output, FALSE);
             break;