[Minor] Move E to the proper place

lualib/dkim_sign_tools.lua

@@ -17,6 +17,7 @@ limitations under the License.
 
 local exports = {}
 
+local E = {}
 local rspamd_logger = require "rspamd_logger"
 local rspamd_util = require "rspamd_util"
 

src/plugins/lua/dkim_signing.lua

@@ -42,7 +42,6 @@ local settings = {
   key_prefix = 'dkim_keys', -- default hash name
 }
 
-local E = {}
 local N = 'dkim_signing'
 local redis_params
 local sign_func = rspamd_plugins.dkim.sign