Don't try to guess the url location

Usually should be a remote URL anyway

BUG: 393987

libdiscover/backends/FlatpakBackend/FlatpakSourcesBackend.cpp

@@ -75,7 +75,7 @@ QAbstractItemModel* FlatpakSourcesBackend::sources()
 bool FlatpakSourcesBackend::addSource(const QString &id)
 {
     FlatpakBackend* backend = qobject_cast<FlatpakBackend*>(parent());
-    const QUrl flatpakrepoUrl = QUrl::fromUserInput(id);
+    const QUrl flatpakrepoUrl(id);
 
     if (id.isEmpty() || !flatpakrepoUrl.isValid())
         return false;