crop: Do alignment only if ratio_d and ratio_n are not 0.

This is important to avoid divide by zero while trying
to align the crop area.

Fixes #19428

Author: TurboGit

src/iop/crop.c

@@ -911,7 +911,7 @@ static void _event_aspect_presets_changed(GtkWidget *combo, dt_iop_module_t *sel
       p->ratio_d = -d;
 
     p->ratio_n = n;
-    p->aligned = p->ratio_d != 0 || p->ratio_n != 0;
+    p->aligned = p->ratio_d != 0 && p->ratio_n != 0;
 
     dt_conf_set_int("plugins/darkroom/crop/ratio_d", abs(p->ratio_d));
     dt_conf_set_int("plugins/darkroom/crop/ratio_n", abs(p->ratio_n));