STORM-688 FIXED Sidebar becomes semitransparent if dock semitransparent side...

STORM-688 FIXED Sidebar becomes semitransparent if dock semitransparent side panel back to the Sidebar

- Before docking the tab back to the sidetray, set floater's children to non-transparent state

- After detaching tab from the sidetray there is no need to set manually floater's children transparency. It happens automatically when floater gets focus.