Tweak progress bar message
Tweak progress bar message

Say "copying" instead of "fetching" when copying from another local
store. Nice for nixos-install.

vcunat/nix,dtzWill/nix,vcunat/nix,shlevy/nix,layus/nix,dezgeg/nix,dezgeg/nix,NixOS/nix,zimbatm/nix,peti/nix,pikajude/nix,dtzWill/nix,dezgeg/nix,zimbatm/nix,peti/nix,rycee/nix,NixOS/nix,rycee/nix,peti/nix,dtzWill/nix,ehmry/nix,pikajude/nix,ehmry/nix,NixOS/nix,shlevy/nix,NixOS/nix,layus/nix,dtzWill/nix,zimbatm/nix,shlevy/nix,layus/nix,dezgeg/nix,ehmry/nix,ehmry/nix,layus/nix,shlevy/nix,shlevy/nix,dezgeg/nix,peti/nix,rycee/nix,pikajude/nix,rycee/nix,vcunat/nix,vcunat/nix,peti/nix,NixOS/nix,layus/nix,ehmry/nix,zimbatm/nix,ehmry/nix,rycee/nix,dtzWill/nix