fix dup_filter_sink lose source_loc (#2549)

Co-authored-by: zhuyadong <zhuyadong@kedacom.com>

include/spdlog/sinks/dup_filter_sink.h

@@ -67,7 +67,7 @@ protected:
             auto msg_size = ::snprintf(buf, sizeof(buf), "Skipped %u duplicate messages..", static_cast<unsigned>(skip_counter_));
             if (msg_size > 0 && static_cast<size_t>(msg_size) < sizeof(buf))
             {
-                details::log_msg skipped_msg{msg.logger_name, level::info, string_view_t{buf, static_cast<size_t>(msg_size)}};
+                details::log_msg skipped_msg{msg.source, msg.logger_name, level::info, string_view_t{buf, static_cast<size_t>(msg_size)}};
                 dist_sink<Mutex>::sink_it_(skipped_msg);
             }
         }