[FIX] web editor: animation triggered on every backspace

This commit fixes the issue of animations that got trigger by backspacing, pressing enter
and other causes

The cause of the issue was a custom historyRevert event that was only used to
trigger a widgets_start_request event which ended up restarting the options,
which lead to the animation option replaying the animation.

We were not able to pinpoint the use of this particular trigger_up as it does
not seem to serve any purpose anymore. Since its presence does create a bug, we
decided that the best course of action was to remove it. If this commit creates
a regression and the original bug comes back, we will reassess the situation.

Task-2752421

closes odoo/odoo#131026

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>