zgrviewer: pass arguments and use full java path

So the user doesn't need java in their environment and can pass
filenames on the command line.

pkgs/applications/graphics/zgrviewer/default.nix

@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     cp -r target/* "$out/share/java/zvtm/"
 
     echo '#!/bin/sh' > "$out/bin/zgrviewer"
-    echo "java -jar '$out/share/java/zvtm/zgrviewer-${version}.jar'" >> "$out/bin/zgrviewer"
+    echo "${jre}/lib/openjdk/jre/bin/java -jar '$out/share/java/zvtm/zgrviewer-${version}.jar' \"\$@\"" >> "$out/bin/zgrviewer"
     chmod a+x "$out/bin/zgrviewer"
   '';
   meta = {