[FIX] web_editor: fix uneditable block when height > 10000px

When applied, this commit will restore the edition of a block when
the content has a height > 10000px.

Steps to reproduce:
1) Go to a runbot
2) Go to a blog or on the homepage
3) Enter edit mode
4) Add some text in one bloc with a total height above 10000px
5) The text will be uneditable on the top

Current behavior:
If the text is too important in one block (more than 10000px),
the text will be uneditable

Expected behavior:
The text should be accessible and editable even if the block
has too much content

opw-3393570

closes odoo/odoo#127719

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>