[rubygems/rubygems] Remove unnecessary code

`@host` _could_ be `nil` at this point, but only if all the conditions
above for setting `@host` were `nil`. In that case, it is guaranteed
to `default_gem_server` metadata is `nil` since it's one of the
branches in that condition. So this code would just be setting an
already `nil` variable to `nil`. Hence, not needed.

https://github.com/rubygems/rubygems/commit/e3ccff3c5c

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