Fix to remove extra spaces in cookie manager intervenes other components

[windkit]

Particularly, https://github.com/Schluca/streamlit_tree_select will break as the iframe was first initialized with height=0

While this is partly due to other component's behavior (in this example, its height is dynamically determined by dynamic data), the fix is impacting other components, I wonder if it is possible to pinpoint the impact to cookie_manager iframes.

[mostaphaRoudsari]

We also have a similar issue on our end. This particular commit is hiding all the elements of our Streamlit components.

1fa9839