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dirstatemap: fix copymap.pop in Rust to return the value it pops

Authored by marmoute.

Description

dirstatemap: fix copymap.pop in Rust to return the value it pops

I guess this was overlooked in the initial implementation?

Without this, the next patch would, loose copy information in setparent.

Differential Revision: https://phab.mercurial-scm.org/D11580