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nixos/printers: Fix ShellCheck issue

Fixes the following warning when setting
`systemd.enableStrictShellChecks = true`:

> In /nix/store/a3mk99mgl10a4k3maxx361hdli5p2rip-unit-script-ensure-printers-start/bin/ensure-printers-start line 6:
> /nix/store/26fb46gwc5sbd045nj3dxw4zqpml359i-cups-2.4.11/bin/lpadmin -D 'virtual printer for cups-pdf instance pdf' -L '/var/spool/cups-pdf-pdf/users/${USER}' -m CUPS-PDF_opt.ppd -p pdf -v cups-pdf:/pdf -E
> ^-- SC2016 (info): Expressions don't expand in single quotes, use double quotes for that.

Victor Engmark 6bb5aa2d a1945f76

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Changed files
+1
nixos
modules
hardware
printers.nix
+1
nixos/modules/hardware/printers.nix 
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      );


     

       
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    in


     

       
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    ''


     

       

       
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      # shellcheck disable=SC2016


     

       
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      ${pkgs.cups}/bin/lpadmin ${args} -E


     

       
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    '';


     

       
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