all-packages: remove orphaned ImageMagick arguments

Quick fix: evaluation was broken by fallout from 7f0a596.

pkgs/top-level/all-packages.nix

···
   };
 
   imagemagick_light = imagemagick.override {
-    libcl = null;
-    perl = null;
-    jemalloc = null;
     bzip2 = null;
     zlib = null;
     libX11 = null;
     libXext = null;
     libXt = null;
-    dejavu_fonts = null;
-    fftw = null;
-    libfpx = null;
-    djvulibre = null;
     fontconfig = null;
     freetype = null;
     ghostscript = null;
-    graphviz = null;
-    jbigkit = null;
     libjpeg = null;
     lcms2 = null;
-    openjpeg = null;
-    liblqr1 = null;
-    xz = null;
     openexr = null;
-    pango = null;
     libpng = null;
     librsvg = null;
     libtiff = null;
-    libwebp = null;
     libxml2 = null;
   };