LibWeb/CSS: Stop invalidating style when setting an animation's effect #1813
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This reverts 6d25bf3
Invalidating the style here means that transitions can cause an element to leave style computation with its "needs style update" flag set to true. This then causes a VERIFY to fail in the TreeBuilder.
This invalidation does not otherwise seem to have any effect. The original commit suggests this was to fix a bug, but it's not clear what bug that was. If it reappears, we can try to solve the issue in a different way.
Fixes #1586.