Fix reactions that were supposed to raise dock widgets.

The move to separate panels from dockwidgets (!2750 (merged)) left code that intended to show the current dock-widget dysfunctional (you must call →raise() on the QDockWidget, not on the QWidget panel it contains). This fixes situations such as aeva/aeva#309 (closed), where the operation toolbox and the parameter editor dock-widgets are tabbed together; selecting an operation in the toolbox would not bring up the parameter editor panel. Similarly, pressing Ctrl+Space (the "operation finder" shortcut) would not bring up the operation toolbox.

This fixes aeva/aeva#309 (closed).