Fix placement of Panel widget

Since #1611 and 41d62f5749b05c68131b752c605191518eaf19d5,
the floating argument for panels is correctly handled.
Here, we don't want the panel to be floating.

Author: rhaschke

visualization/motion_planning_tasks/src/task_panel.cpp

@@ -155,9 +155,8 @@ void TaskPanel::request(rviz::WindowManagerInterface* window_manager) {
 	if (SINGLETON || !vis_frame)
 		return;  // already defined, nothing to do
 
-	QDockWidget* dock =
-	    vis_frame->addPanelByName("Motion Planning Tasks", "moveit_task_constructor/Motion Planning Tasks",
-	                              Qt::LeftDockWidgetArea, true /* floating */);
+	QDockWidget* dock = vis_frame->addPanelByName(
+	    "Motion Planning Tasks", "moveit_task_constructor/Motion Planning Tasks", Qt::LeftDockWidgetArea);
 	Q_UNUSED(dock);
 	assert(dock->widget() == SINGLETON);
 }