sporadic mariabackup.compression_providers_unloaded failure

depending on the scheduling, a purge thread might try to open a
compressed table too. And fail, as a compression plugin is unloaded.

mysql-test/suite/mariabackup/compression_providers_unloaded.result

 call mtr.add_suppression("Background Page read failed to read, uncompress, or decrypt");
 call mtr.add_suppression("Table is compressed or encrypted but uncompress or decrypt failed");
+call mtr.add_suppression("Refusing to load corrupted table");
 #
 # Testing mariabackup with bzip2 compression
 #

mysql-test/suite/mariabackup/compression_providers_unloaded.test

 let $alg = $MTR_COMBINATIONS;
 call mtr.add_suppression("Background Page read failed to read, uncompress, or decrypt");
 call mtr.add_suppression("Table is compressed or encrypted but uncompress or decrypt failed");
+call mtr.add_suppression("Refusing to load corrupted table");
 
 if (`select count(*) = 0 from information_schema.plugins where plugin_name = 'provider_$alg' and plugin_status='active'`)
 {