[Fix] #3400 milter_headers: fix inverted logic for extended_headers_rcpt

This commit fixes the inverted logic of skip_wanted/match_extended_headers_rcpt to allow a user to enable extended headers selectively for only a specific set of recipients.

src/plugins/lua/milter_headers.lua

@@ -158,10 +158,6 @@ local function milter_headers(task)
     end
 
 
-    if settings.extended_headers_rcpt and match_extended_headers_rcpt() then
-      return false
-    end
-
     if settings.skip_local and not settings.local_headers[hdr] then
       local ip = task:get_ip()
       if (ip and ip:is_local()) then return true end
@@ -171,6 +167,10 @@ local function milter_headers(task)
       if task:get_user() ~= nil then return true end
     end
 
+    if settings.extended_headers_rcpt and not match_extended_headers_rcpt() then
+      return true
+    end
+
     return false
 
   end