Fix safe triangle bottom position.

Just a not for when this is started to test it with RTL too.

Hi @ckrina,
I just got a bit confused from the issue summary. Can you kindly update the issue summary in a more descriptive way and steps to reproduce the same! That'll be really helpful.
Thanks :)

@sourojeetpaul I've taken a crack at re-stating the issue in the description. Hopefully that makes the issue clearer.

@finnsky Hopefully I'm still accurately describing the issue. I re-wrote most of it 😬.

This is great IS!

I've re-tested the issue. While its still reproducible on the latest 11.x, it does seem less pronounced at least.

After discussing in Slack, we've decided to remove the "Navigation stable blocker" tag. As its edge case, and doesn't prevent the user from using the module, it does not need to block Navigation becoming stable.

Updated to remove the user menu issue as that is fixed.