main: fix desktop file name

Commit 49d83fd9 changed the name of
Jami's .desktop file, but didn't make the corresponding change to the
argument passed to setDesktopFileName in the main() function. This
causes a bug where GNOME (and possibly other desktop environments)
doesn't display the correct icon in the taskbar when Jami is running.

GitLab: #1948
Change-Id: I695057979b180777011a9995d799d38f9a4a0487

src/app/main.cpp

@@ -80,7 +80,7 @@ main(int argc, char* argv[])
 
     MainApplication app(argc, argv);
 
-    app.setDesktopFileName(QStringLiteral("jami"));
+    app.setDesktopFileName(QStringLiteral("net.jami.Jami"));
 #if defined(Q_OS_MACOS)
     if (macutils::isMetalSupported()) {
         QQuickWindow::setGraphicsApi(QSGRendererInterface::MetalRhi);