clean.sh: Do not reset lib/vscode

Now that we've moved to the submodule, there is no need to reset changes
in there :)

cc @jsjoeio

ci/build/clean.sh

@@ -9,7 +9,6 @@ main() {
 
   pushd lib/vscode
   git clean -xffd
-  git reset --hard
   popd
 }