[FIX] website_blog: remove negative word spacing in blog snippet

Since [1] when the blog layout was refactored between 12.0 and 13.0, a
negative word spacing was introduced in the blog post snippet with the
big pictures layout.

This commit removes this negative word spacing.

[1]: https://github.com/odoo/odoo/commit/bb0cdec4594fab8c22265ed8af0c2d431a263b72



task-2822436

closes odoo/odoo#88548

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