[Fix] Modal workaround

[matheus-rosa-jsm]

The problem

In the version 7.0 of ionic ion-modal has an undesired behavion on backdrop. It block body scrolling.
Inonic issue: ionic-team/ionic-framework#23942
This issue was resolved in the new ionic maijor version, 8.0

What is needed

To avoid this behavior was created an workaround and it will be no longer needed after the ionic upgrade. So is necessary remove it.

PR with the workaround: #534

It's necessary remove all manual interaction with backdrop-no-scroll class:
document.body.classList.remove(BACKDROP_NO_SCROLL)

[tassioFront]

We needed to improve the workaround as more issues were happening. The last adjustments are found here.