emacsWithPackages: don't call package-initialize

Emacs will call package-initialize itself, if required, or the user will
call it in their initialization file. There is no reason to call it in
the wrapper and doing so only increases start-up time.

pkgs/build-support/emacs/wrapper.nix

@@ -57,8 +57,6 @@ stdenv.mkDerivation {
       addToEmacsPaths $pkg
     done
 
-    echo "(package-initialize)" >>"$siteStart"
-
     # Byte-compiling improves start-up time only slightly, but costs nothing.
     emacs --batch -f batch-byte-compile "$siteStart"