Since commit 01d961086c1d175732c597dc9acdba7cc4cd2d26, MainWindow::refreshDisplay()
is called in the refreshDiveInfo() signal of maintab after editing a
dive site. Since this was the only use of the refreshDiveInfo signal,
remove this signal and instead connect to MainWindow::refreshDisplay directly.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2a0520d57d