remove qt5compat

Signed-off-by: Trial97 <alexandru.tripon97@gmail.com>

launcher/ui/dialogs/AboutDialog.cpp

@@ -48,9 +48,12 @@ namespace {
 QString getCreditsHtml()
 {
     QFile dataFile(":/documents/credits.html");
-    dataFile.open(QIODevice::ReadOnly);
-
+    if (!dataFile.open(QIODevice::ReadOnly)) {
+        qWarning() << "Failed to open file '" << dataFile.fileName() << "' for reading!";
+        return {};
+    }
     QString fileContent = QString::fromUtf8(dataFile.readAll());
+    dataFile.close();
 
     return fileContent.arg(QObject::tr("%1 Developers").arg(BuildConfig.LAUNCHER_DISPLAYNAME), QObject::tr("MultiMC Developers"),
                            QObject::tr("With special thanks to"));