[Minor] Avoid callback symbol to be treated as normal

src/plugins/lua/reputation.lua

@@ -1168,9 +1168,14 @@ local function parse_rule(name, tbl)
   end)
 
   -- We now generate symbol for checking
+  local rule_type = 'normal'
+  if rule.selector.config.split_symbols then
+    rule_type = 'callback'
+  end
+
   local id = rspamd_config:register_symbol{
     name = rule.symbol,
-    type = 'normal',
+    type = rule_type,
     callback = callback_gen(reputation_filter_cb, rule),
   }