Fix misbehavior of toolbars after click without drag on a grabber...

... only lately introduced at b3c8f5db3d

src/toolbars/ToolDock.cpp

@@ -835,13 +835,8 @@ void ToolDock::OnGrabber( GrabberEvent & event )
 {
    // auto pos = event.GetPosition();
    if (!event.IsEscaping()) {
-      ToolBar *t = mBars[ event.GetId() ];
-
       // Pass it on to the manager since it isn't in the handling hierarchy
       mManager->ProcessEvent( event );
-
-      // We no longer have control
-      mConfiguration.Remove( t );
    }
 }