Add vcard_photo to /executable autocompletion

Was forgotten in f934c5b59.

src/command/cmd_ac.c

@@ -1115,6 +1115,7 @@ cmd_ac_init(void)
     autocomplete_add(executable_ac, "urlopen");
     autocomplete_add(executable_ac, "urlsave");
     autocomplete_add(executable_ac, "editor");
+    autocomplete_add(executable_ac, "vcard_photo");
 
     intype_ac = autocomplete_new();
     autocomplete_add(intype_ac, "console");