refactor(InstanceImport): require rvalue from 'extra_info' mappings

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

launcher/InstanceImportTask.h

@@ -56,7 +56,7 @@ class InstanceImportTask : public InstanceTask
 {
     Q_OBJECT
 public:
-    explicit InstanceImportTask(const QUrl sourceUrl, QWidget* parent = nullptr, QMap<QString, QString> extra_info = {});
+    explicit InstanceImportTask(const QUrl sourceUrl, QWidget* parent = nullptr, QMap<QString, QString>&& extra_info = {});
 
     bool abort() override;
     const QVector<Flame::File> &getBlockedFiles() const