Add "mythology" qualifier to Egyptian gods tag

Posted under Tags

BUR #11730 has been approved by @nonamethanks.

rename anubis -> anubis_(mythology)
rename bastet -> bastet_(mythology)
rename horus -> horus_(mythology)
rename osiris -> osiris_(mythology)
rename ptah -> ptah_(mythology)
rename ra -> ra_(mythology)
rename sobek -> sobek_(mythology)
rename thoth -> thoth_(mythology)

The tags for generic depiction of some of the Egyptian mythology gods like Anubis and Bastet does not have (mythology) qualifier like the other myth character tag. I think it should be added for consistency.