MDEV-15797 Assertion `thd->killed != 0' failed in ha_maria::enable_indexes

Problem was that a parallel open of a table, overwrote info->state that
was in used by repair.

Fixed by changing _ma_tmp_disable_logging_for_table() to use
a new state buffer state.no_logging to store the temporary state.

Other things:
- Use original number of rows when retrying repair to get rid of a
  potential warning "Number of rows changed from X to Y"
- Changed maria_commit() to make it easier to merge with 10.4
- If table is not locked (like with show commands), use the global
  number of rows as the local number may not be up to date.
  (Minor not critical fix)
- Added some missing DBUG_RETURN

storage/maria/ma_commit.c

@@ -98,7 +98,7 @@ int maria_commit(MARIA_HA *info)
   if (!info->s->now_transactional)
     return 0;
   trn= info->trn;
-  info->trn= 0;                                 /* checked in maria_close() */
+  _ma_reset_trn_for_table(info);
   return ma_commit(trn);
 }