Normalize rfam table names
Normalize rfam table names

It is better to just use 'rfam_' as the prefix for all tables that have
to do with rfam results, no need for the 'rnc_rfam_' prefix.

RNAcentral/rnacentral-webcode,RNAcentral/rnacentral-webcode,RNAcentral/rnacentral-webcode,RNAcentral/rnacentral-webcode