[Fix] Fix rules setup

rules/headers_checks.lua

@@ -12,7 +12,7 @@ distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-]]--
+]] --
 
 local util = require "rspamd_util"
 local ipairs = ipairs
@@ -1158,7 +1158,7 @@ local function is_8bit_addr(addr)
   return false;
 end
 
-rspamd_config.INVALID_FROM_8BIT = {
+local invalid_from_8bit = {
   callback = function(task)
     local from = (task:get_from('mime') or {})[1] or {}
     if is_8bit_addr(from) then
@@ -1171,7 +1171,7 @@ rspamd_config.INVALID_FROM_8BIT = {
   group = 'headers'
 }
 
-rspamd_config.INVALID_RCPT_8BIT = {
+local invalid_rcpt_8bit = {
   callback = function(task)
     local rcpts = task:get_recipients('mime') or {}
     return fun.any(function(rcpt)
@@ -1188,14 +1188,17 @@ rspamd_config.INVALID_RCPT_8BIT = {
 
 if rspamd_config:is_mime_utf8() then
   -- Disable some of the rules preserving the underlying logic
-  rspamd_config.INVALID_FROM_8BIT.condition = function()
+  invalid_from_8bit.condition = function()
     return false
   end
-  rspamd_config.INVALID_RCPT_8BIT.condition = function()
+  invalid_rcpt_8bit.condition = function()
     return false
   end
 end
 
+rspamd_config.INVALID_FROM_8BIT = invalid_from_8bit
+rspamd_config.INVALID_RCPT_8BIT = invalid_rcpt_8bit
+
 rspamd_config.XM_CASE = {
   callback = function(task)
     return task:has_header('X-mailer', true)