[FIX] web_tour: tip not visible anymore on notebook header
[FIX] web_tour: tip not visible anymore on notebook header

Since commit: odoo/enterprise@e662ef36296afb2787eb694a33b4c6616a5e1326
a 'div' wrapper was added around the notebook header.

The tip was not visible due to it's location in the wrapper with
'overflow: hidden'.

After this commit, the tip is appended to the ancestor of the wrapper
and so it's visible again.
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