Programmatic retrieval of layers' visibility always returns `true`

Hello again :) Our team might have found a bug while using the Layer Manager API: every call to component.viewLayer.isVisible() seems to always return true, regardless of their actual state. Steps to reproduce:Open the demoSwitch to the layers panelClick on the eye icon to hide the "Body" layerOpen the consoleExecuting editor.getWrapper().viewLayer.isVisible() returns 1 instead of false Looking at the code, I believe this.model.getStyle() should be used instead of this.model.get('style') (which always returns {}) to retrieve the current display value. As always, I'd be happy to open a PR to f...