Fixes #14018

* Fix lost focus after modal closes

Regression caused by the use of the wicg-inert polyfill

* Fix regression introduced by wicg-inert

* Catch errors to please CodeClimate

* Inserting wicg-inert in project

* Import wicg-inert in moda_root component

* Update yarn.lock

* Solving code style problems

* Removing package-lock

The modal-handling code gives back focus to the element focused when the
modal opened. However, in the case of reply confirmation, it would do so
*after* the composer code itself requested focus.