migration: fix counting normal page for compression

The compressed page is not normal page
Reviewed-by: NPeter Xu <peterx@redhat.com>
Signed-off-by: NXiao Guangrong <xiaoguangrong@tencent.com>
Reviewed-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NJuan Quintela <quintela@redhat.com>

migration/ram.c

@@ -1910,7 +1910,6 @@ retry:
             qemu_cond_signal(&comp_param[idx].cond);
             qemu_mutex_unlock(&comp_param[idx].mutex);
             pages = 1;
-            ram_counters.normal++;
             ram_counters.transferred += bytes_xmit;
             break;
         }