CI: tools: skip including dl dir in prebuilt tools tar

We can now drop the dl dir in the prebuilt tools tar as package archieve
is not a requirement anymore and won't trigger a package recompile.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

.github/workflows/build-tools.yml

@@ -61,7 +61,7 @@ jobs:
         if: inputs.generate_prebuilt_artifacts == true
         shell: su buildbot -c "sh -e {0}"
         working-directory: openwrt
-        run: tar --mtime=now -cf tools.tar staging_dir/host build_dir/host dl
+        run: tar --mtime=now -cf tools.tar staging_dir/host build_dir/host
 
       - name: Upload prebuilt tools
         if: inputs.generate_prebuilt_artifacts == true