horsegen: generate koka id lists as public

horsegen/saddle.kk.template

@@ -14,7 +14,7 @@ extern create-id-table(): vector<int>
   c inline "int32_t arr[] = { {{- range $s := $.Saddles }}{{ $s.ID }},{{ end -}} };\nkk_vector_from_cint32array(arr, (kk_ssize_t){{ $.SaddleCount }}, kk_context())"
   js inline "[{{ range $s := $.Saddles }}{{ $s.ID }},{{ end }}]"
 // Vector of all saddle IDs in order for easy iterating.
-val all = once(create-id-table)
+pub val all = once(create-id-table)
 
 // Get the name for a saddle.
 // Alternate versions of saddles have an indication of their ID in their names.