fix: abort search if we're already trying to download a pack

Meaning we don't have to wait for the searches to finish in the
background to finally start the modpack download, when we have already
selected it -_-

Signed-off-by: flow <flowlnlnln@gmail.com>

launcher/ui/pages/modplatform/ftb/FtbListModel.h

@@ -47,9 +47,12 @@ public:
     QVariant data(const QModelIndex &index, int role) const override;
 
     void request();
+    void abortRequest();
 
     void getLogo(const QString &logo, const QString &logoUrl, LogoCallback callback);
 
+    [[nodiscard]] bool isMakingRequest() const { return jobPtr.get(); }
+
 private slots:
     void requestFinished();
     void requestFailed(QString reason);
@@ -65,6 +68,8 @@ private:
     void requestLogo(QString file, QString url);
 
 private:
+    bool m_aborted = false;
+
     QList<ModpacksCH::Modpack> modpacks;
     LogoMap m_logoMap;