Ensure power per band settings are honoured when changing band from the rig

Thanks to Mike, W9MDB, for this patch.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@8553 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

mainwindow.cpp

@@ -1925,6 +1925,7 @@ void MainWindow::displayDialFrequency ()
       ui->bandComboBox->setCurrentText (band_name);
       m_wideGraph->setRxBand (band_name);
       m_lastBand = band_name;
+      band_changed(dial_frequency);
     }
 
   // search working frequencies for one we are within 10kHz of (1 Mhz