ZIndexUtils Support for ConfirmDialog

[Jin-K]

This way, confirm dialogs will not appear behind a dialog that asks for confirmation.

primeng/src/app/components/confirmdialog/confirmdialog.ts

Line 424 in 617ac71

this.container.style.zIndex = String(this.baseZIndex + (++DomHandler.zindex));

primeng/src/app/components/dialog/dialog.ts

Line 407 in 617ac71

ZIndexUtils.set('modal', this.container, this.baseZIndex + this.config.zIndex.modal);