Persist player skins set with /character

mods/rgt_cosmetics/init.lua

@@ -38,7 +38,13 @@ end)
 
 minetest.register_chatcommand("character", {
     func = function(name, args)
-        ns.set_character(rgt.players[name], args)
+        local m = rgt.players[name]
+        if ns.characters[args] then
+            m.object:get_meta():set_string("character", args)
+            ns.set_character(m, args)
+        else
+            tell(name, "That character does not exist.")
+        end
     end
 })