treewide: remove trailing space in description

Done using `grep -rP 'description\s+=\s+"[^"]+[ ]";' | cut -d ':' -f 1 |
xargs -i nvim {}` and sorting the opened files by hand, avoiding
generated packages list

pkgs/development/libraries/java/jffi/default.nix

@@ -65,7 +65,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   meta = with lib; {
     broken = stdenv.isDarwin;
-    description = "Java Foreign Function Interface ";
+    description = "Java Foreign Function Interface";
     homepage = "https://github.com/jnr/jffi";
     platforms = platforms.unix;
     license = licenses.asl20;