profile: call clearHandlers() in setPlanState()

This function, which removes the handlers from the profile, was called
in setAddState() but not in setPlanState(). In the latter case it was
called explicitly by the caller.

Move the call from the caller into the function. This allows us to
make clearHandlers() private in to the profile widget.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

profile-widget/profilewidget2.cpp

@@ -1352,6 +1352,7 @@ void ProfileWidget2::setPlanState()
 	if (currentState == PLAN)
 		return;
 
+	clearHandlers();
 	setProfileState();
 	mouseFollowerHorizontal->setVisible(true);
 	mouseFollowerVertical->setVisible(true);