DiveListView::reload() was called for full reset of the dive list
and for changing the view (tree vs. lis) in DiveListView::headerClicked().
Since the latter does sorting by itself, a parameter "forceSort" was
introduced, which defaulted to true, but was set to false by
DiveListView::headerClicked().
To remove complexity, simply let DiveListView::headerClicked() set
the view by itself and remove tha parameter.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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