Remove needless check
Starting `dockerd-rootless.sh` checks that `$HOME` is writeable, but does not
require it to be so.
Make the check more precise, and check that it actually exists and is a
directory.
@@ -28,8 +28,8 @@ if ! [ -w $XDG_RUNTIME_DIR ]; then
echo "XDG_RUNTIME_DIR needs to be set and writable"
exit 1
fi
-if ! [ -w $HOME ]; then
- echo "HOME needs to be set and writable"
+if ! [ -d $HOME ]; then
+ echo "HOME needs to be set and exist."
exit 1
fi
