Firstly, the parameter appears conceptually wrong, as replot suggests
that the currently shown dive is replot. Secondly, the only caller that
passed a parameter was passing in current_dive, which is just what happens
if one doesn't pass a parameter. Therefore, change that caller (call
plotDive directly) and remove the parameter.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
d520ac2286