MDEV-37558 Multi-batch recovery discards needed doublewrite pages

Problem:
=======
In multi-batch recovery, pages with LSN > recv_sys.scanned_lsn
are discarded from doublewrite buffer. Later when
reading a corrupted page from disk, corresponding dblwr page
is no longer available. This leads to failure of InnoDB recovery.

Solution:
=========
In buf_dblwr_t::recover(): Replace recv_sys.scanned_lsn
with max_lsn when checking if a page's LSN is within
the recovery range.

Author: Thirunarayanan

storage/innobase/buf/buf0dblwr.cc

@@ -384,7 +384,7 @@ void buf_dblwr_t::recover() noexcept
     const page_t *const page= *i;
     const uint32_t page_no= page_get_page_no(page);
     const lsn_t lsn= mach_read_from_8(page + FIL_PAGE_LSN);
-    if (recv_sys.parse_start_lsn > lsn || lsn > recv_sys.scanned_lsn)
+    if (recv_sys.parse_start_lsn > lsn || lsn > max_lsn)
       /* Pages written before or after the recovery range are not usable. */
       continue;
     const uint32_t space_id= page_get_space_id(page);