Made it more similar to mrpack export

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

launcher/modplatform/flame/FlamePackExportTask.h

@@ -42,6 +42,8 @@ class FlamePackExportTask : public Task {
 
    private:
     static const QString TEMPLATE;
+    static const QStringList PREFIXES;
+    static const QStringList FILE_EXTENSIONS;
 
     // inputs
     const QString name, version, author;