egg-palettize: fix writing Magfilter

Fixes a typo that applied the value from the Minfilter to the entry of the Magfilter.

Closes #1585

pandatool/src/egg-palettize/txaFileFilter.cxx

@@ -93,7 +93,7 @@ post_load(Texture *tex) {
   egg_tex->set_alpha_mode(tex_image.get_alpha_mode());
   egg_tex->set_format(props._format);
   egg_tex->set_minfilter(props._minfilter);
-  egg_tex->set_minfilter(props._magfilter);
+  egg_tex->set_magfilter(props._magfilter);
   egg_tex->set_anisotropic_degree(props._anisotropic_degree);
 
   tex->set_aux_data("egg", egg_tex);