[Minor] Remove assertions as sometimes neural exists without settings...

lualib/lua_settings.lua

@@ -32,10 +32,6 @@ local lua_util = require "lua_util"
 local rspamd_logger = require "rspamd_logger"
 
 local function register_settings_cb(from_postload)
-  if not from_postload then
-    assert(false, 'invalid invocation')
-  end
-
   if not post_init_performed then
     all_symbols = rspamd_config:get_symbols()