[FIX] web_editor: bs4 '.is-invalid' not applied in technical modal

Adding bs4 `.is-invalid` class is supposed to add red borders on the
`form-control` element.

But the mixin `o-w-preserve-forms` prevents that style to be applied as it adds
`border: 1px solid $o-we-color-text-light;` on `.form-control`.
As the mixin selector has more strength (specificity), the bs4 is simply not
applied.

This is the case for `form-control` inside `o_technical_modal`.

closes odoo/odoo#27691

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