fix(ui): SSignalButton cannot be hide/show when inside a view

Description

Call first IGuiContainer enable/disable and setVisibility slots in SSignalButton.

This fix the bug where is SSignalButton was hiden in a SView, it was impossible to show it again.

Closes #1048 (closed)

How to test it?

Check #1048 (closed) for details.

It is testable within SightViewer and the Pacs selection window.

Some results