Remove useless indirecion

void ObservingList::removeObject(SkyObject *o, bool sessionView) {
    if ( sessionView )
        slotRemoveObject( o, true );
    else
        slotRemoveObject( o );
}

equivalent to:

void ObservingList::removeObject(SkyObject *o, bool sessionView) {
    slotRemoveObject( o, sessionView );
}