SELCAL should restore band activity

mainwindow.cpp

@@ -7907,7 +7907,10 @@ void MainWindow::on_selcalButton_clicked(){
         }
         if(ui->tableWidgetRXAll->isVisible()){
             ui->tableWidgetRXAll->setVisible(false);
+            m_bandActivityWasVisible = true;
         }
+    } else {
+        ui->tableWidgetRXAll->setVisible(m_bandActivityWasVisible);
     }
     displayCallActivity();
 }

mainwindow.h

@@ -726,6 +726,7 @@ private:
     QList<ActivityDetail> msgs;
   };
 
+  bool m_bandActivityWasVisible;
   bool m_rxDirty;
   bool m_rxDisplayDirty;
   int m_txFrameCountEstimate;