switch users of "gnupg1" to plain "gnupg"

gnupg is gnupg 2.2. gnupg1 is also gnupg 2.2, just with a few extra
symlinks in the bin directory. None of these packages need those
symlinks, and it's confusing for them to say they're depending on
"gnupg1", so switch their dep to plain "gnupg".

pkgs/tools/backup/duply/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, coreutils, python2, duplicity, gawk, gnupg1, bash
+{ stdenv, fetchurl, coreutils, python2, duplicity, gawk, gnupg, bash
 , gnugrep, txt2man, makeWrapper, which
 }:
 
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
     mkdir -p "$out/share/man/man1"
     install -vD duply "$out/bin"
     wrapProgram "$out/bin/duply" --set PATH \
-        ${stdenv.lib.makeBinPath [ coreutils python2 duplicity gawk gnupg1 bash gnugrep txt2man which ]}
+        ${stdenv.lib.makeBinPath [ coreutils python2 duplicity gawk gnupg bash gnugrep txt2man which ]}
     "$out/bin/duply" txt2man > "$out/share/man/man1/duply.1"
   '';