Fixed unncessary tight loop hash copy in saveindex where a pointer can be used instea...

Fixed unncessary tight loop hash copy in saveindex where a pointer can be used instead. Can speed up refreshes by nearly 50% in some circumstances.

I *think* this is ok, at least it results in close to the same index being
saved as before. The difference is that plugins that have a pagestate of {}
have that recorded this way, while with the tight loop, the key for the
plugin in not copied in that case. I cannot see how this could matter.