dbench: move loadfiles from $out/share/ to $out/share/loadfiles/

Seems cleaner.

Hm, there are also loadfiles in $out/share/doc/dbench/loadfiles/
(installed by the upstream build system), but there is no iscsi/
directory in there.

Changed files
+1 -1
pkgs
development
tools
misc
dbench
+1 -1
pkgs/development/tools/misc/dbench/default.nix
···
'';
postInstall = ''
-
cp -R loadfiles/* $out/share
+
cp -R loadfiles/ $out/share/
'';
meta = with stdenv.lib; {