set background for themes

src/mainwindow.cpp

@@ -906,9 +906,11 @@ void MainWindow::setupTransactionsTab() {
 
     // Set up context menu on transactions tab
     auto theme = Settings::getInstance()->get_theme_name();
-     if (theme == "dark"){
+    if (theme == "dark" || theme == "midnight") {
     ui->listChat->setStyleSheet("background-image: url(res/sdlogo.png) ;background-attachment: fixed ;background-position: center center ;background-repeat: no-repeat;background-size: cover");
-     }else{ui->listChat->setStyleSheet("background-image: url(res/sdlogo2.png) ;background-attachment: fixed ;background-position: center center ;background-repeat: no-repeat;background-size: cover");}
+     }
+    if (theme == "default") {ui->listChat->setStyleSheet("background-image: url(res/sdlogo2.png) ;background-attachment: fixed ;background-position: center center ;background-repeat: no-repeat;background-size: cover");}
+   
     ui->listChat->setResizeMode(QListView::Adjust);
     ui->listChat->setWordWrap(true);
     ui->listChat->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
@@ -997,6 +999,7 @@ void MainWindow::setupTransactionsTab() {
 
         menu.exec(ui->transactionsTable->viewport()->mapToGlobal(pos));        
     });
+    
 }
 
 void MainWindow::setupchatTab() {