prefixed reference relation drop bug

[reshke]

spqr-console=> show reference_relations;
 table name | schema version | shards
------------+----------------+--------
 zz         | 1              | []
 zzx        | 1              | []
(2 rows)

spqr-console=> drop reference relation zz;
ERROR:  too much distributions matched: 2
spqr-console=> drop reference relation zzx;
 drop reference table
----------------------
 table -> zzx
(1 row)

spqr-console=> drop reference relation zz;
 drop reference table
----------------------
 table -> zz
(1 row)

[Denchick]

It is still actual