icon helper: Fix an argument order mishap

It seems that for a long time, no compiler saw it fit to warn
about this, even though they argument types are not the same.

gtk/gtkiconhelper.c

@@ -83,8 +83,8 @@ get_icon_lookup_flags (GtkIconHelper *self,
 static GdkPaintable *
 ensure_paintable_for_gicon (GtkIconHelper    *self,
                             GtkCssStyle      *style,
-                            GtkTextDirection  dir,
                             int               scale,
+                            GtkTextDirection  dir,
                             gboolean          preload,
                             GIcon            *gicon,
                             gboolean         *symbolic)
@@ -104,8 +104,9 @@ ensure_paintable_for_gicon (GtkIconHelper    *self,
   icon = gtk_icon_theme_lookup_by_gicon (icon_theme,
                                          gicon,
                                          MIN (width, height),
+                                         scale,
                                          dir,
-                                         scale, flags);
+                                         flags);
 
   *symbolic = gtk_icon_paintable_is_symbolic (icon);
   return GDK_PAINTABLE (icon);