[fix](mtmv)Fix the old version of the materialized view error 'Current database is not set'`

[zddr]

cause by: https://github.com/apache/doris/pull/36543

after 36543,not need set db&catalog in ConnectContext, because query sql Because the query statement was rewritten to the full path (ctl.db. table. col) during creation,

but query sql of old materialized view not was rewritten, so need set db&catalog in ConnectContext